Language: C++

#include <bits/stdc++.h>
using namespace std;
int A[10010][2];
int S[10010][10010];
int N, M, x1, y1, x2, y2, xn, yn, ans;
int ANS = 0;
int *R;
int Xs[10010], Ys[10010];
map<int,int> zipx, zipy;
int unzipx[10010], unzipy[10010];
int MAX = 1000000001;

int compress(int *X, map<int, int> &zip, int *unzip, int n) {
    sort(X, X + n);
    R = unique(X, X + n);
	int k = R - X;
    for(int i = 0; i < k; i++){
        zip[X[i]] = i;
        unzip[i] = X[i];
    }
    return k;
}

int main(){
	cin >> N >> M;
	for (int n = 0; n < N; n++) {
		cin >> x1 >> y1;
		A[n][0] = x1; A[n][1] = y1;
		Xs[n * 2] = x1;
		Xs[n * 2 + 1] = x1 - 1;
		Ys[n * 2] = y1;
		Ys[n * 2 + 1] = y1 - 1;
	}
	
	Xs[N * 2] = -1 * MAX;
	Xs[N * 2 + 1] = MAX;
	Ys[N * 2] = -1 * MAX;
	Ys[N * 2 + 1] = MAX;
	
	xn = compress(Xs, zipx, unzipx, N * 2 + 2);
	yn = compress(Ys, zipy, unzipy, N * 2 + 2);
	
	
	for (int n = 0; n < N; n ++) {
		x1 = zipx[A[n][0]];
		y1 = zipy[A[n][1]];
		S[x1][y1] ++;
	}
	
	for (int x = 1; x <= xn; x++) {
		for (int y = 1; y <= yn; y ++) {
			S[x][y] += S[x - 1][y] + S[x][y - 1] - S[x - 1][y - 1];
		}
	}
	for (int m = 0; m < M; m ++) {
		cin >> x1 >> y1 >> x2 >> y2;
		
		x1 = *lower_bound(Xs, Xs + xn, x1 - 1);
		y1 = *lower_bound(Ys, Ys + yn, y1 - 1);
		x2 = *lower_bound(Xs, Xs + xn, x2);
		y2 = *lower_bound(Ys, Ys + yn, y2);
		
		x1 = zipx[x1];
		x2 = zipx[x2];
		y1 = zipy[y1];
		y2 = zipy[y2];
		
		ans = S[x2][y2] - S[x1][y2] - S[x2][y1] + S[x1][y1];
		
		cout << ans << endl;
	}
	/*for (int i = 0; i < 10 ;i ++ ) {
		for (int j = 0; j < 10; j++) {
			cout << S[i][j];
		}
		cout << endl;
	}*/
	
}


Compiler output:
a.cc:5:15: error: 'int y1' redeclared as different kind of entity
    5 | int N, M, x1, y1, x2, y2, xn, yn, ans;
      |               ^~
In file included from /usr/include/features.h:523,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:683,
                 from /usr/include/c++/14/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:33,
                 from a.cc:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:257:1: note: previous declaration 'double y1(double)'
  257 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
a.cc:5:31: error: 'int yn' redeclared as different kind of entity
    5 | int N, M, x1, y1, x2, y2, xn, yn, ans;
      |                               ^~
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:258:1: note: previous declaration 'double yn(int, double)'
  258 | __MATHCALL (yn,, (int, _Mdouble_));
      | ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:27:27: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   27 |                 cin >> x1 >> y1;
      |                 ~~~~~~~~~ ^~ ~~
      |                     |        |
      |                     |        double(double) noexcept
      |                     std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included 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/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   27 |                 cin >> x1 >> y1;
      |                              ^~
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(short int)y1' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(short unsigned int)y1' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(int)y1' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(unsigned int)y1' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(long int)y1' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(long unsigned int)y1' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(long long int)y1' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(long long unsigned int)y1' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |                              ^~
      |                              |
      |                              double (*)(double) noexcept
a.cc:27:30: error: cannot bind rvalue '(void*)y1' to 'void*&'
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:27:30: error: invalid conversion from 'double (*)(double) noexcept' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   27 |                 cin >> x1 >> y1;
      |