Language: C++

/* ----------------------- reclone_rk --------------------------------------------*/ 
#include<bits/stdc++.h>
using namespace std;
#define int long long int
const int mod=1e9+7;

#define FastRead ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define prq priority_queue<int>
#define prqp priority_queue<pair<int,int>>
#define vtr vector<int>
#define INF INT_MAX
#define NINF INT_MIN
#define endl "\n"
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define pvtr vector<pair<int,int>>
#define FOR(i,a,n) for (int i=(a);i<=(n);++i)

int gcd(int a, int b){ if(a == 0) return b; return gcd(b%a, a);}
int MOD(int n){ return ((n%mod)+mod)%mod;}
int power(int a,int b){ if(b==0)return 1LL;int s=power(a,b/2LL);s*=s;s%=mod;if(b&1LL)return (s*a)%mod;return s;}
int inv(int a){return power(a,mod-2);}
int nCr(int n,int r){if(r>n)return 0LL;if(n-r<r)r=n-r;int ans=1;for(int i=0;i<r;i++){ans*=(n-i);ans=MOD(ans);ans*=inv(i+1);ans=MOD(ans);}return ans;}

const double pi = 3.14159265358979323846;
signed main()
{   
    int n;
    cin>>n;
    string s = to_string(s);
    if(s[0]=='7' || s[1] == '7' || s[2] == '7')
    	cout<<"Yes"<<endl;
    else
    	cout<<"No"<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:32:25: error: no matching function for call to 'to_string(std::string&)'
   32 |     string s = to_string(s);
      |                ~~~~~~~~~^~~
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:2:
/usr/include/c++/14/bits/basic_string.h:4240:3: note: candidate: 'std::string std::__cxx11::to_string(int)'
 4240 |   to_string(int __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4240:17: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'int'
 4240 |   to_string(int __val)
      |             ~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4259:3: note: candidate: 'std::string std::__cxx11::to_string(unsigned int)'
 4259 |   to_string(unsigned __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4259:22: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'unsigned int'
 4259 |   to_string(unsigned __val)
      |             ~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4275:3: note: candidate: 'std::string std::__cxx11::to_string(long int)'
 4275 |   to_string(long __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4275:18: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'long int'
 4275 |   to_string(long __val)
      |             ~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4294:3: note: candidate: 'std::string std::__cxx11::to_string(long unsigned int)'
 4294 |   to_string(unsigned long __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4294:27: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'long unsigned int'
 4294 |   to_string(unsigned long __val)
      |             ~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4310:3: note: candidate: 'std::string std::__cxx11::to_string(long long int)'
 4310 |   to_string(long long __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4310:23: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'long long int'
 4310 |   to_string(long long __val)
      |             ~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4327:3: note: candidate: 'std::string std::__cxx11::to_string(long long unsigned int)'
 4327 |   to_string(unsigned long long __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4327:32: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'long long unsigned int'
 4327 |   to_string(unsigned long long __val)
      |             ~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4401:3: note: candidate: 'std::string std::__cxx11::to_string(float)'
 4401 |   to_string(float __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4401:19: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'float'
 4401 |   to_string(float __val)
      |             ~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4411:3: note: candidate: 'std::string std::__cxx11::to_string(double)'
 4411 |   to_string(double __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4411:20: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'double'
 4411 |   to_string(double __val)
      |             ~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4421:3: note: candidate: 'std::string std::__cxx11::to_string(long double)'
 4421 |   to_string(long double __val)
      |   ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4421:25: note:   no known conversion for argument 1 from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'long double'
 4421 |   to_string(long double __val)
      |             ~~~~~~~~~~~~^~~~~