criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include "bits/stdc++.h"
using namespace std;
char s[100], a, b;
int len = 0, len1 = 0;
int main()
{
	cin>>s;
	for(int i=0; i < strlen(s); i++)
	{
		len1 = strlen(s)-2;
		len = strlen(s);
		a = s[0];
		b = s[len-1];
	}
	cout << a << len1 << b < <endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:34: error: expected primary-expression before '<' token
   15 |         cout << a << len1 << b < <endl;
      |                                  ^
Language: C++

#include "pch.h"

////////////////////////////////////////////////////////
////////////////////////////////////////////////////////
////////////////////////////////////////////////////////

#include <iostream>
#include <string>
using namespace std;

int main()
{
	string s, ans;
	cin >> s;

	ans = s.substr(1, s.size() - 1);

	cout << s.substr(0, 1) << ans.size() - 1 << s.substr(s.size() - 1, 1) << endl;
}



Compiler output:
a.cc:1:10: fatal error: pch.h: No such file or directory
    1 | #include "pch.h"
      |          ^~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main(){
  	string s;
  	cin >> s;
  	int n = s.size();
  	cout << s[0] + str(n-2) + s[n-1] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:24: error: 'str' was not declared in this scope; did you mean 'std'?
    9 |         cout << s[0] + str(n-2) + s[n-1] << endl;
      |                        ^~~
      |                        std
Language: C++

    #include <iostream>
    #include <string>
     
    int main(){
      string s;
      cin>>s;
      cout<<s[0]<<(s.length()-2)<<s[s.length()-1]<<endl;
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:5:7: error: 'string' was not declared in this scope
    5 |       string s;
      |       ^~~~~~
a.cc:5:7: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:6:7: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |       cin>>s;
      |       ^~~
      |       std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:12: error: 's' was not declared in this scope
    6 |       cin>>s;
      |            ^
a.cc:7:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |       cout<<s[0]<<(s.length()-2)<<s[s.length()-1]<<endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:7:52: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    7 |       cout<<s[0]<<(s.length()-2)<<s[s.length()-1]<<endl;
      |                                                    ^~~~
      |                                                    std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <iostream>
#include <string>

int main(){
  sting s;
  cin>>s;
  cout<<s[0]<<(s.length()-2)<<s[s.length()-1]<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'sting' was not declared in this scope
    5 |   sting s;
      |   ^~~~~
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin>>s;
      |   ^~~
      |   std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s;
      |        ^
a.cc:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout<<s[0]<<(s.length()-2)<<s[s.length()-1]<<endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:7:48: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    7 |   cout<<s[0]<<(s.length()-2)<<s[s.length()-1]<<endl;
      |                                                ^~~~
      |                                                std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <bits/stdc++.h>

using namespace std;
int main(){
  int a, b;
  cin>>a>>b;


  cout<<a*b/2

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: expected ';' before 'return'
    9 |   cout<<a*b/2
      |              ^
      |              ;
   10 | 
   11 |   return 0;
      |   ~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define _GLIBCXX_DEBUG //これつけるとA[N]でもいいらしい
//for文のマクロ
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define mp(a,b) make_pair(a,b)
#define big 1000000007
#define all(a) sort((a).begin(),(a).end()) //ソートのマクロ
#define Re(a) reverse((a).begin(),(a).end())
#define YN(a) if(a){cout<<"Yes"<<endl;}else cout<<"No"<<endl;//条件によってYes、Noを出力する
const int MOD=1000000007;
int main(){
  string s;
  cin>>s;
  int n=s.length();
  cout<<s[0];
  cout<<n-2;
  cout<<s[n-1]<<endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:18:22: error: expected '}' at end of input
   18 |   cout<<s[n-1]<<endl;
      |                      ^
a.cc:12:11: note: to match this '{'
   12 | int main(){
      |           ^
Language: C++

#include <iostream>
#include <string.h>
#include <string>
using namespace std;

void a_already2018(void) {
	string s;
	cin >> s;
	s[3] = '8';
	cout << s << endl;
}

void b_i18n(void) {
	string s;
	cin >> s;
	int word_len = s.size()-2;
	string s_out = s[0] + to_string(word_len) + s[s.size() - 1];
	cout << s_out << endl;

}

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>
using namespace std;
 

int main() {
  string;
  cin >> s;
  
  cout << s[0] + (s.size() - 2) + s[-1] << endl;
    
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: declaration does not declare anything [-fpermissive]
    6 |   string;
      |   ^~~~~~
a.cc:7:10: error: 's' was not declared in this scope
    7 |   cin >> s;
      |          ^
Language: C++

#include <iostream>
using namespace std;

int main(){
	string s; cin >> s;
  	int len = s.size();
  
  	cout << s[0];
  	cout << n-2;
  	cout << s[n-1] << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:17: error: 'n' was not declared in this scope
    9 |         cout << n-2;
      |                 ^
Language: C++


#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main(){
    string s; cin >> s;
    cout << s[0] << s.size() - 2 << s[n-1] << endl;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:39: error: 'n' was not declared in this scope
    8 |     cout << s[0] << s.size() - 2 << s[n-1] << endl;
      |                                       ^
Language: C

/* ex6_2
   tamayama */

#include<stdio.h>
#define SIZE 101

int main(void){
    char str1[SIZE];    /*文字列の配列を用意*/
    int i;
    int count=0;
    char first;
    char final;

    for(i=0;i<SIZE;i++){    /*ヌル文字を挿入*/
        str1[i] = '\0';
    }

    scanf("%s",str1);    /*入力された文字数をカウントする*/
    for(i=0;i<SIZE;i++){
        if(str1[i] != '\0'){
            count++;
        }
    }
    first = str1[0];    /*最初の文字*/
    final = str1[count-1];    /*最後の文字*/
    printf("%c%d%c\n",first,count-2,last);    /*真ん中の文字数は、（全体の文字数）-2*/
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:26:37: error: 'last' undeclared (first use in this function)
   26 |     printf("%c%d%c\n",first,count-2,last);    /*真ん中の文字数は、（全体の文字数）-2*/
      |                                     ^~~~
main.c:26:37: note: each undeclared identifier is reported only once for each function it appears in
Language: C

/* ex_6-2. nknm */

#include <stdio.h>
#include <string.h>

int main(void){
    
    int word_num, i;
    char imput[100];

    scanf("%s", imput);

    word_num = int strlen(imput);

    printf("%c %d %c\n", imput[0], word_num - 2, imput[word_num - 1]);

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:16: error: expected expression before 'int'
   13 |     word_num = int strlen(imput);
      |                ^~~
Language: C

/* ex_6-2. nknm */

#include <stdio.h>
#include <string.h>

int main(void){
    
    int word_num, i;
    char imput[100];

    scanf("%s", imput);

    printf("%c %d %c", imput[0], int strlen(imput) - 2, imput[int strlen(imput) - 1]);

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:34: error: expected expression before 'int'
   13 |     printf("%c %d %c", imput[0], int strlen(imput) - 2, imput[int strlen(imput) - 1]);
      |                                  ^~~
Language: C

/*  ex6_2
    hangan2020 */

#include <stdio.h>
#include <string.h>
#define IS 102　//Initial string array length

int main(void){
    char eng_str[IS] = {};
    int len, inbetween_no;

  	//Input character string (including null)
    fgets(eng_str, IS, stdin);
    len = strlen(eng_str);
  
    inbetween_no = len - 3; // String length include null at the end of string (thus -3)
    
  	//Print out in the followning order
    printf("%c%d%c\n", eng_str[0], inbetween_no, eng_str[len - 2]);

    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:6:15: error: stray '\343' in program
    6 | #define IS 102<U+3000>//Initial string array length
      |               ^~~~~~~~
main.c:9:18: note: in expansion of macro 'IS'
    9 |     char eng_str[IS] = {};
      |                  ^~
main.c:6:15: error: stray '\343' in program
    6 | #define IS 102<U+3000>//Initial string array length
      |               ^~~~~~~~
main.c:13:20: note: in expansion of macro 'IS'
   13 |     fgets(eng_str, IS, stdin);
      |                    ^~
Language: C

/*  ex6_2
    potter0723sw  */

#include <stdio.h>
#include <string.h>

int main(void){
    int num、last;
    char string[101];//ヌル文字分含め確保
    scanf("%s", &string);
    num = (int)strlen(string) - 2;//省略するのは最初と最後以外
    last = (int)strlen(string) - 1;//ヌル文字に注意
    printf("%c%d%c\n", string[1], num, string[last]);
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:12: error: stray '\343' in program
    8 |     int num<U+3001>last;
      |            ^~~~~~~~
main.c:8:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'last'
    8 |     int num、last;
      |              ^~~~
main.c:8:14: error: 'last' undeclared (first use in this function)
main.c:8:14: note: each undeclared identifier is reported only once for each function it appears in
main.c:11:5: error: 'num' undeclared (first use in this function)
   11 |     num = (int)strlen(string) - 2;//省略するのは最初と最後以外
      |     ^~~
Language: C

/*  ex6_2
    potter0723sw  */

#include <stdio.h>
#include <string.h>

int main(void){
    int num;
    char string[101];//ヌル文字分含め確保
    scanf("%s", &formula);
    num = (int)strlen(string) - 2;//省略するのは最初と最後以外
    printf("%c%d%c\n", string[1], num, string[(int)strlen(string)]);
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:10:18: error: 'formula' undeclared (first use in this function)
   10 |     scanf("%s", &formula);
      |                  ^~~~~~~
main.c:10:18: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include<stdio.h>
#include<stlib.h>

#define SIZE 101

int main(void)
{
  int length;
  char message[SIZE];
  
  fgets(message, SIZE, stdin);
  
  length = strlen(message);
  
  printf("%c%d%c",message[0], length - 2, message[length-1]);
  
  return 0;
}

Compiler output:
a.cc:2:9: fatal error: stlib.h: No such file or directory
    2 | #include<stlib.h>
      |         ^~~~~~~~~
compilation terminated.
Language: C

#include <stdio.h>
#include <string.h>
int main(void){
  char sentence[101];
  int between;
  scanf("%s",sentence);
  between = strlen(sentence) - 2;
  strcat(sentence[0],between,sentence[strlen(sentence)-1]);
  printf("%s\n",sentence[0]);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:18: error: passing argument 1 of 'strcat' makes pointer from integer without a cast [-Wint-conversion]
    8 |   strcat(sentence[0],between,sentence[strlen(sentence)-1]);
      |          ~~~~~~~~^~~
      |                  |
      |                  char
In file included from main.c:2:
/usr/include/string.h:149:39: note: expected 'char * restrict' but argument is of type 'char'
  149 | extern char *strcat (char *__restrict __dest, const char *__restrict __src)
      |                      ~~~~~~~~~~~~~~~~~^~~~~~
main.c:8:22: error: passing argument 2 of 'strcat' makes pointer from integer without a cast [-Wint-conversion]
    8 |   strcat(sentence[0],between,sentence[strlen(sentence)-1]);
      |                      ^~~~~~~
      |                      |
      |                      int
/usr/include/string.h:149:70: note: expected 'const char * restrict' but argument is of type 'int'
  149 | extern char *strcat (char *__restrict __dest, const char *__restrict __src)
      |                                               ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
main.c:8:3: error: too many arguments to function 'strcat'
    8 |   strcat(sentence[0],between,sentence[strlen(sentence)-1]);
      |   ^~~~~~
/usr/include/string.h:149:14: note: declared here
  149 | extern char *strcat (char *__restrict __dest, const char *__restrict __src)
      |              ^~~~~~
Language: C

/*  ex6_1
    kosaq       */

#include <stdio.h>
#include <string.h>
#define SIZE 101//十分な要素数

int main(void){
    char string_s[SIZE];//入力に使う文字列を定義
    int number_total;//全文字数を定義

    scanf("%s", string_s);//文字列を入力

    number_total = strlen(string_s);//全文字数は入力された文字列の長さに等しい

    printf("%c%d%c\n", string_s[0], number_total - 2, string_s[i - 1]);
    //string_s[0]は先頭の文字を出力、number_total - 2は間の文字数を出力、string_s[i - 1]は最後の文字を出力
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:16:64: error: 'i' undeclared (first use in this function)
   16 |     printf("%c%d%c\n", string_s[0], number_total - 2, string_s[i - 1]);
      |                                                                ^
main.c:16:64: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <stdc++.h>
using namespace std;


int main() {
  string s;
  cin >> s;
  cout << s.at(0) << s.length() - 2 << s.at(s.length()) << endl;
}

Compiler output:
a.cc:1:10: fatal error: stdc++.h: No such file or directory
    1 | #include <stdc++.h>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
using P = pair<int, int>;

int main()
{
    string s;
    cout << s[0] << s.size() - 2 << s[s.size()-1]
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:50: error: expected ';' before 'return'
   11 |     cout << s[0] << s.size() - 2 << s[s.size()-1]
      |                                                  ^
      |                                                  ;
   12 |     return 0;
      |     ~~~~~~
Language: Java

import java.util.*;

public class Main{
	
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
  	ch[] ch=sc.next().toCharArray();
    int n=ch.length;
    System.out.println(ch[0]+(n-2)+ch[n-1]);
  }
}


Compiler output:
Main.java:7: error: cannot find symbol
  	ch[] ch=sc.next().toCharArray();
  	^
  symbol:   class ch
  location: class Main
1 error
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main(){

  string s;
  cin >> s;

  int size = s.size();

  stirng first = s[0];
  string last = s[size-1];
  int number = size-2;

  cout <<first+number+last<<endl;
 }

Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: 'stirng' was not declared in this scope
   12 |   stirng first = s[0];
      |   ^~~~~~
a.cc:13:25: error: conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
   13 |   string last = s[size-1];
      |                         ^
a.cc:16:10: error: 'first' was not declared in this scope
   16 |   cout <<first+number+last<<endl;
      |          ^~~~~
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main(){

  string s;
  cin >> s;

  int sSize = s.size();
  cout << s[0] + (sSize - 2) + s[i-1] <<endl;

 }

Compiler output:
a.cc: In function 'int main()':
a.cc:11:34: error: 'i' was not declared in this scope
   11 |   cout << s[0] + (sSize - 2) + s[i-1] <<endl;
      |                                  ^
Language: C++

#include <iostream>
#include <bits/stdc++.h>
#include <vector>
#include <algorithm>
#include <cctype>
#include <string>

using namespace std;

int main(){

  string s;
  cin >> s;

  cout << s[0] << s.size()-2; << s[s.size()-1] << endl;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:31: error: expected primary-expression before '<<' token
   15 |   cout << s[0] << s.size()-2; << s[s.size()-1] << endl;
      |                               ^~
Language: C++

#include <bits/stdc++.h>
#define ALL(a) (a).begin(), (a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define pb push_back
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define rep(i, n) FOR(i, 0, n)
#define ll long long
using namespace std;

const ll P = 1000000007;
int gcd(int a, int b) { return b != 0 ? gcd(b, a % b) : a; }
int lcm(int a, int b) { return a / gcd(a, b) * b; }

int main()
{
  cout << fixed << setprecision(10);
  string S
  cin >> S;
  int N;
  N = S.size()
  cout << S[0] << N-2 << S[N-1] << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:3: error: expected initializer before 'cin'
   18 |   cin >> S;
      |   ^~~
a.cc:20:7: error: 'S' was not declared in this scope
   20 |   N = S.size()
      |       ^
Language: C

s=input()
  print(s[0]+str((len(s)-2))+s[-1])

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | s=input()
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 's' [-Wimplicit-int]
main.c:1:3: error: implicit declaration of function 'input' [-Wimplicit-function-declaration]
    1 | s=input()
      |   ^~~~~
main.c:1:3: error: initializer element is not constant
main.c:2:3: error: expected ',' or ';' before 'print'
    2 |   print(s[0]+str((len(s)-2))+s[-1])
      |   ^~~~~
Language: C

s=input()
print(s[0]+str(len(s)-2)+s[-1])

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | s=input()
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 's' [-Wimplicit-int]
main.c:1:3: error: implicit declaration of function 'input' [-Wimplicit-function-declaration]
    1 | s=input()
      |   ^~~~~
main.c:1:3: error: initializer element is not constant
main.c:2:1: error: expected ',' or ';' before 'print'
    2 | print(s[0]+str(len(s)-2)+s[-1])
      | ^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  // ここにプログラムを追記
  string S;
  cin>> S;
  char a,b;
  a = S[0];
  b = S[S,size() -1];
  int x = S.size();
    cout << a << x-2 << b << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:15: error: no matching function for call to 'size()'
   10 |   b = S[S,size() -1];
      |           ~~~~^~
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/range_access.h:262:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.size()) std::size(const _Container&)'
  262 |     size(const _Container& __cont) noexcept(noexcept(__cont.size()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:262:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:272:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::size_t std::size(const _Tp (&)[_Nm])'
  272 |     size(const _Tp (&)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:272:5: note:   candidate expects 1 argument, 0 provided
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  // ここにプログラムを追記
  string S;
  cin>> S;
  char a,b;
  a = S[0];
  b = S[S,size()-1];
  int x = S.size();
    cout << a << x-2 << b << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:15: error: no matching function for call to 'size()'
   10 |   b = S[S,size()-1];
      |           ~~~~^~
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/range_access.h:262:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.size()) std::size(const _Container&)'
  262 |     size(const _Container& __cont) noexcept(noexcept(__cont.size()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:262:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:272:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::size_t std::size(const _Tp (&)[_Nm])'
  272 |     size(const _Tp (&)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:272:5: note:   candidate expects 1 argument, 0 provided
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  // ここにプログラムを追記
  string S;
  cin>> S;
  char a,b;
  a = S[0];
  b = S[S,size()-1];
  int x = S.size()
    cout << a << x-2 << b << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:15: error: no matching function for call to 'size()'
   10 |   b = S[S,size()-1];
      |           ~~~~^~
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/range_access.h:262:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.size()) std::size(const _Container&)'
  262 |     size(const _Container& __cont) noexcept(noexcept(__cont.size()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:262:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:272:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::size_t std::size(const _Tp (&)[_Nm])'
  272 |     size(const _Tp (&)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:272:5: note:   candidate expects 1 argument, 0 provided
a.cc:12:5: error: expected ',' or ';' before 'cout'
   12 |     cout << a << x-2 << b << endl;
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  // ここにプログラムを追記
  string S;
  cin>> S;
  char a,b;
  a = S[0];
  b = S[S,size()-1];
    cout << a << S.size()-2 << b << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:15: error: no matching function for call to 'size()'
   10 |   b = S[S,size()-1];
      |           ~~~~^~
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/range_access.h:262:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.size()) std::size(const _Container&)'
  262 |     size(const _Container& __cont) noexcept(noexcept(__cont.size()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:262:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:272:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::size_t std::size(const _Tp (&)[_Nm])'
  272 |     size(const _Tp (&)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:272:5: note:   candidate expects 1 argument, 0 provided
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  // ここにプログラムを追記
  string S;
  cin>> S;
  char a,b;
  a = S[0]
  b = S[S,size()-1]
    cout << a << S.size()-2 << b << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: expected ';' before 'b'
    9 |   a = S[0]
      |           ^
      |           ;
   10 |   b = S[S,size()-1]
      |   ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string S;cin >> S;
  cout << S[0] << S.size()-2 << S[S.size-1] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:37: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
    6 |   cout << S[0] << S.size()-2 << S[S.size-1] << endl;
      |                                   ~~^~~~
      |                                         ()
Language: Java

import java.util.*;

public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            String str = sc.next();
            System.out.println(str.substring(0,1) + str.length()-2 + str.substring(str.length()-1, str.length()));
          }
}

Compiler output:
Main.java:7: error: bad operand types for binary operator '-'
            System.out.println(str.substring(0,1) + str.length()-2 + str.substring(str.length()-1, str.length()));
                                                                ^
  first type:  String
  second type: int
1 error
Language: C++

#include <bits/stdc++.h>
using nanespace std;

int main() {
  string s;
  cin >> s;
  
  cout << s[0] << s.size() - 2 << s[s.size()] << endl;
}  

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'nanespace'
    2 | using nanespace std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'string' was not declared in this scope
    5 |   string s;
      |   ^~~~~~
a.cc:5:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> s;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:10: error: 's' was not declared in this scope
    6 |   cin >> s;
      |          ^
a.cc:8:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   cout << s[0] << s.size() - 2 << s[s.size()] << endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:8:50: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    8 |   cout << s[0] << s.size() - 2 << s[s.size()] << endl;
      |                                                  ^~~~
      |                                                  std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int n=s.size();
  int m=s.size();
  n-=2;
  string ans=s[0]+'n'+s[m-1];
  cout << ans << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:22: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    9 |   string ans=s[0]+'n'+s[m-1];
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int n=s.size();
  n-=2;
  string ans=s[0]+'n'+s[s.size()-1];
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:22: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    8 |   string ans=s[0]+'n'+s[s.size()-1];
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main(){
  if(s.size() > 2){
    cout << s.at(0) << s.size() - 2 << s.at(s.size()-1) << endl;
  }
  else cout << s << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:6: error: 's' was not declared in this scope
    6 |   if(s.size() > 2){
      |      ^
Language: C++

#include <bis/stdc++.h>
using namespace std;

string n;

int main(void)
{
    cin>>n;
    cout<<n[0]<<n.size()-2<<n[n.size()-1];
    return 0;
}

Compiler output:
a.cc:1:10: fatal error: bis/stdc++.h: No such file or directory
    1 | #include <bis/stdc++.h>
      |          ^~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string a;
    cin>>a;
    cout<<a[0]<<a.length-2<<a[a.length-1];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:19: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
    7 |     cout<<a[0]<<a.length-2<<a[a.length-1];
      |                 ~~^~~~~~
      |                         ()
a.cc:7:33: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
    7 |     cout<<a[0]<<a.length-2<<a[a.length-1];
      |                               ~~^~~~~~
      |                                       ()
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string a;
    cin>>a;
    cout<<a[0]<<a.length-2<<s[a.length-1];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:19: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
    7 |     cout<<a[0]<<a.length-2<<s[a.length-1];
      |                 ~~^~~~~~
      |                         ()
a.cc:7:29: error: 's' was not declared in this scope
    7 |     cout<<a[0]<<a.length-2<<s[a.length-1];
      |                             ^
a.cc:7:33: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
    7 |     cout<<a[0]<<a.length-2<<s[a.length-1];
      |                               ~~^~~~~~
      |                                       ()
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  int t = s.size();
  cout << s.size(0) << s.size() - 2 << s.size(t) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: no matching function for call to 'std::__cxx11::basic_string<char>::size(int)'
    8 |   cout << s.size(0) << s.size() - 2 << s.size(t) << endl;
      |           ~~~~~~^~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:1076:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 1076 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:1076:7: note:   candidate expects 0 arguments, 1 provided
a.cc:8:46: error: no matching function for call to 'std::__cxx11::basic_string<char>::size(int&)'
    8 |   cout << s.size(0) << s.size() - 2 << s.size(t) << endl;
      |                                        ~~~~~~^~~
/usr/include/c++/14/bits/basic_string.h:1076:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 1076 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:1076:7: note:   candidate expects 0 arguments, 1 provided
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  int t = s.size()
  cout << s.size(0) << s.size() - 2 << s.size(t);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'cout'
    8 |   cout << s.size(0) << s.size() - 2 << s.size(t);
      |   ^~~~
Language: C++

using namespace std;

int main() {
    string s;
    cin >> s;
  　size_t size = str.length();
    size = size - 2
    cout << s[0] + size + s[size_t] << endl;
}

Compiler output:
a.cc:6:3: error: extended character 　 is not valid in an identifier
    6 |   　size_t size = str.length();
      |   ^
a.cc: In function 'int main()':
a.cc:4:5: error: 'string' was not declared in this scope
    4 |     string s;
      |     ^~~~~~
a.cc:1:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
  +++ |+#include <string>
    1 | using namespace std;
a.cc:5:5: error: 'cin' was not declared in this scope
    5 |     cin >> s;
      |     ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:5:12: error: 's' was not declared in this scope
    5 |     cin >> s;
      |            ^
a.cc:6:3: error: '\U00003000size_t' was not declared in this scope
    6 |   　size_t size = str.length();
      |   ^~~~~~~~
a.cc:7:5: error: 'size' was not declared in this scope
    7 |     size = size - 2
      |     ^~~~
Language: Java

import java.util.*;

class Main
{
  public static void main(String[] args)
  {
    Scanner sc = new Scanner(System.in);
    
    String s = sc.nextInt();
    
    int sLength = s.length();
    String s1 = s.substring(0, 1);
    String s2 = s.substring(sLength - 1, sLength);
    
    String num = String.valueOf(sLength - 2);
    
    String ans = s1 + num + s2;
    
    System.out.println(ans);
    
  }
}

Compiler output:
Main.java:9: error: incompatible types: int cannot be converted to String
    String s = sc.nextInt();
                         ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;
  cin>>s;
  int n=s.size()
  cout<<s.at(0)<<"n-2"<<s.at(n-1)<<endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'cout'
    8 |   cout<<s.at(0)<<"n-2"<<s.at(n-1)<<endl;
      |   ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;
  cin>>s;
  int n=s.size()
  cout<<s.at(0)<<n-2<<s.at(n-1)<<endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'cout'
    8 |   cout<<s.at(0)<<n-2<<s.at(n-1)<<endl;
      |   ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;
  cin>>s;
  int n=s.size()
  cout<<s.at(0)<<n-1<<s.at(n)<<endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'cout'
    8 |   cout<<s.at(0)<<n-1<<s.at(n)<<endl;
      |   ^~~~
Language: C

#include<stdio.h>
#include<string.h>

int main(void)
{
    char s[100];
  
    scanf("%s",s);
  
    int n=(strlen(a))-2;
  
    printf("%c%d%c",a[0],n,a[n+1]);
  
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:19: error: 'a' undeclared (first use in this function)
   10 |     int n=(strlen(a))-2;
      |                   ^
main.c:10:19: note: each undeclared identifier is reported only once for each function it appears in
Language: Java

import java.util.*;

public class Main{
  public static void main(Stinrg[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    int len = S.lenght()-2;
    char s1 = S.charAt(0);
    char s2 = S.charAt(S.length()-1);
    System.out,println(s1+len+s2);
  }
}
    
    

Compiler output:
Main.java:10: error: not a statement
    System.out,println(s1+len+s2);
          ^
Main.java:10: error: ';' expected
    System.out,println(s1+len+s2);
              ^
2 errors
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
string S;
  cin>>S;
  int n=S.size();
  string x=stoi(n-2);
  cout<<S.at(0)+x+S.at(n-1)<<endl;
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:16: error: no matching function for call to 'stoi(int)'
    7 |   string x=stoi(n-2);
      |            ~~~~^~~~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:4164:3: note: candidate: 'int std::__cxx11::stoi(const std::string&, std::size_t*, int)'
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4164:22: note:   no known conversion for argument 1 from 'int' to 'const std::string&' {aka 'const std::__cxx11::basic_string<char>&'}
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4432:3: note: candidate: 'int std::__cxx11::stoi(const std::wstring&, std::size_t*, int)'
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4432:23: note:   no known conversion for argument 1 from 'int' to 'const std::wstring&' {aka 'const std::__cxx11::basic_string<wchar_t>&'}
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~~^~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string s, kari;
  int count;
  
  cin >> s;
  count = s.size();
  kari = s[s.size() - 1];
  
  s[2] = kari;
  
  cout << s[0] << s.size()-2 << s[2] << endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:10: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} in assignment
   11 |   s[2] = kari;
      |          ^~~~
      |          |
      |          std::string {aka std::__cxx11::basic_string<char>}
Language: C++

#include<iostream>
#include<cstring>
using namespace std;
char s[10005];
int main()
{
    gets(s);
    cout << s[0] << strlen(s)-2 << s[strlen(s)-1];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |     gets(s);
      |     ^~~~
      |     getw
Language: C++

#include<iostream>
using namespace std;
char s[10005];
int main()
{
    gets(s);
    cout << s[0] << strlen(s)-2 << s[strlen(s)-1];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    6 |     gets(s);
      |     ^~~~
      |     getw
a.cc:7:21: error: 'strlen' was not declared in this scope
    7 |     cout << s[0] << strlen(s)-2 << s[strlen(s)-1];
      |                     ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | using namespace std;
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main() {
	string s;
	cin >> s;
	int x = s.at();
	cout << s.at(0) << x - 2 << s.at(x - 1) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:21: error: no matching function for call to 'std::__cxx11::basic_string<char>::at()'
    8 |         int x = s.at();
      |                 ~~~~^~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:1287:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::const_reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::at(size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; const_reference = const char&; size_type = long unsigned int]'
 1287 |       at(size_type __n) const
      |       ^~
/usr/include/c++/14/bits/basic_string.h:1287:7: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/basic_string.h:1309:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::at(size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; reference = char&; size_type = long unsigned int]'
 1309 |       at(size_type __n)
      |       ^~
/usr/include/c++/14/bits/basic_string.h:1309:7: note:   candidate expects 1 argument, 0 provided
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main() {
	string s;
	cin >> s;
	int x = s.at();
	cout << s[0] << N - 2 << s[N - 1] << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:21: error: no matching function for call to 'std::__cxx11::basic_string<char>::at()'
    8 |         int x = s.at();
      |                 ~~~~^~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:1287:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::const_reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::at(size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; const_reference = const char&; size_type = long unsigned int]'
 1287 |       at(size_type __n) const
      |       ^~
/usr/include/c++/14/bits/basic_string.h:1287:7: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/basic_string.h:1309:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::at(size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; reference = char&; size_type = long unsigned int]'
 1309 |       at(size_type __n)
      |       ^~
/usr/include/c++/14/bits/basic_string.h:1309:7: note:   candidate expects 1 argument, 0 provided
a.cc:9:25: error: 'N' was not declared in this scope
    9 |         cout << s[0] << N - 2 << s[N - 1] << endl;
      |                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string a;
  cin >> a;
  int x;
  a.at() = 'x';

  cout << a.at(0) << x << a.at(x) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:7: error: no matching function for call to 'std::__cxx11::basic_string<char>::at()'
    8 |   a.at() = 'x';
      |   ~~~~^~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:1287:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::const_reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::at(size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; const_reference = const char&; size_type = long unsigned int]'
 1287 |       at(size_type __n) const
      |       ^~
/usr/include/c++/14/bits/basic_string.h:1287:7: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/basic_string.h:1309:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::at(size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; reference = char&; size_type = long unsigned int]'
 1309 |       at(size_type __n)
      |       ^~
/usr/include/c++/14/bits/basic_string.h:1309:7: note:   candidate expects 1 argument, 0 provided