Language: C++

/*input
*/
#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<double,double> pdd;
#define IOS ios_base::sync_with_stdio(0); cin.tie(0)
#define ALL(a) a.begin(),a.end()
#define SZ(a) ((int)a.size())
#define F first
#define S second
#define REP(i,n) for(int i=0;i<((int)n);i++)
#define pb push_back
#define MP(a,b) make_pair(a,b)
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
#define GET_POS(c,x) (lower_bound(c.begin(),c.end(),x)-c.begin())
#ifdef leowang
#define debug(...) do{\
	fprintf(stderr,"%s - %d : (%s) = ",__PRETTY_FUNCTION__,__LINE__,#__VA_ARGS__);\
	_DO(__VA_ARGS__);\
}while(0)
template<typename I> void _DO(I&&x){cerr<<x<<endl;}
template<typename I,typename...T> void _DO(I&&x,T&&...tail){cerr<<x<<", ";_DO(tail...);}
#else
#define debug(...)
#endif
template<typename T1,typename T2>
ostream& operator<<(ostream& out,pair<T1,T2> P){
	out<<'('<<P.F<<','<<P.S<<')';
	return out;
}
//}}}
const ll maxn=300005;
const ll maxlg=__lg(maxn)+2;
const ll INF64=8000000000000000000LL;
const int INF=0x3f3f3f3f;
const ll MOD=ll(1e9+7);
const double PI=acos(-1);
//const ll p=880301;
//const ll P=31;

ll mypow(ll a,ll b){
	ll res=1LL;
	while(b){
		if(b&1) res=res*a%MOD;
		a=a*a%MOD;
		b>>=1;
	}
	return res;
}

int main()
{
 
	return 0;
}
/*input
*/
#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<double,double> pdd;
#define IOS ios_base::sync_with_stdio(0); cin.tie(0)
#define ALL(a) a.begin(),a.end()
#define SZ(a) ((int)a.size())
#define F first
#define S second
#define REP(i,n) for(int i=0;i<((int)n);i++)
#define pb push_back
#define MP(a,b) make_pair(a,b)
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
#define GET_POS(c,x) (lower_bound(c.begin(),c.end(),x)-c.begin())
#ifdef leowang
#define debug(...) do{\
	fprintf(stderr,"%s - %d : (%s) = ",__PRETTY_FUNCTION__,__LINE__,#__VA_ARGS__);\
	_DO(__VA_ARGS__);\
}while(0)
template<typename I> void _DO(I&&x){cerr<<x<<endl;}
template<typename I,typename...T> void _DO(I&&x,T&&...tail){cerr<<x<<", ";_DO(tail...);}
#else
#define debug(...)
#endif
template<typename T1,typename T2>
ostream& operator<<(ostream& out,pair<T1,T2> P){
	out<<'('<<P.F<<','<<P.S<<')';
	return out;
}
//}}}
const ll maxn=300005;
const ll maxlg=__lg(maxn)+2;
const ll INF64=8000000000000000000LL;
const int INF=0x3f3f3f3f;
const ll MOD=ll(1e9+7);
const double PI=acos(-1);
//const ll p=880301;
//const ll P=31;

ll mypow(ll a,ll b){
	ll res=1LL;
	while(b){
		if(b&1) res=res*a%MOD;
		a=a*a%MOD;
		b>>=1;
	}
	return res;
}

int main()
{
  auto i=time();
 	int n,m;
  cin>>n>>m;
  int tmp=n*100+m;
  while((double)(time()-i)/CLOCKS_PER_SEC*1000<tmp){
  	
  }
	return 0;
}


Compiler output:
a.cc:92:10: error: attribute value 'tune=native' was already specified in 'target' attribute
   92 | ostream& operator<<(ostream& out,pair<T1,T2> P){
      |          ^~~~~~~~
a.cc:92:10: error: redefinition of 'template<class T1, class T2> std::ostream& operator<<(std::ostream&, std::pair<_T1, _T2>)'
a.cc:32:10: note: 'template<class T1, class T2> std::ostream& operator<<(std::ostream&, std::pair<_T1, _T2>)' previously declared here
   32 | ostream& operator<<(ostream& out,pair<T1,T2> P){
      |          ^~~~~~~~
a.cc:97:10: error: redefinition of 'const ll maxn'
   97 | const ll maxn=300005;
      |          ^~~~
a.cc:37:10: note: 'const ll maxn' previously defined here
   37 | const ll maxn=300005;
      |          ^~~~
a.cc:98:10: error: redefinition of 'const ll maxlg'
   98 | const ll maxlg=__lg(maxn)+2;
      |          ^~~~~
a.cc:38:10: note: 'const ll maxlg' previously defined here
   38 | const ll maxlg=__lg(maxn)+2;
      |          ^~~~~
a.cc:99:10: error: redefinition of 'const ll INF64'
   99 | const ll INF64=8000000000000000000LL;
      |          ^~~~~
a.cc:39:10: note: 'const ll INF64' previously defined here
   39 | const ll INF64=8000000000000000000LL;
      |          ^~~~~
a.cc:100:11: error: redefinition of 'const int INF'
  100 | const int INF=0x3f3f3f3f;
      |           ^~~
a.cc:40:11: note: 'const int INF' previously defined here
   40 | const int INF=0x3f3f3f3f;
      |           ^~~
a.cc:101:10: error: redefinition of 'const ll MOD'
  101 | const ll MOD=ll(1e9+7);
      |          ^~~
a.cc:41:10: note: 'const ll MOD' previously defined here
   41 | const ll MOD=ll(1e9+7);
      |          ^~~
a.cc:102:14: error: redefinition of 'const double PI'
  102 | const double PI=acos(-1);
      |              ^~
a.cc:42:14: note: 'const double PI' previously defined here
   42 | const double PI=acos(-1);
      |              ^~
a.cc:106:4: error: attribute value 'tune=native' was already specified in 'target' attribute
  106 | ll mypow(ll a,ll b){
      |    ^~~~~
a.cc:106:4: error: redefinition of 'll mypow(ll, ll)'
a.cc:46:4: note: 'll mypow(ll, ll)' previously defined here
   46 | ll mypow(ll a,ll b){
      |    ^~~~~
a.cc:116:5: error: attribute value 'tune=native' was already specified in 'target' attribute
  116 | int main()
      |     ^~~~
a.cc:116:5: error: redefinition of 'int main()'
a.cc:56:5: note: 'int main()' previously defined here
   56 | int main()
      |     ^~~~
a.cc: In function 'int main()':
a.cc:118:14: error: too few arguments to function 'time_t time(time_t*)'
  118 |   auto i=time();
      |          ~~~~^~
In file included from /usr/include/pthread.h:23,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/gthr.h:157,
                 from /usr/include/c++/14/ext/atomicity.h:35,
                 from /usr/include/c++/14/bits/ios_base.h:39,
                 from /usr/include/c++/14/streambuf:43,
                 from /usr/include/c++/14/bits/streambuf_iterator.h:35,
                 from /usr/include/c++/14/iterator:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:54,
                 from a.cc:3:
/usr/include/time.h:76:15: note: declared here
   76 | extern time_t time (time_t *__timer) __THROW;
      |               ^~~~
a.cc:122:22: error: too few arguments to function 'time_t time(time_t*)'
  122 |   while((double)(time()-i)/CLOCKS_PER_SEC*1000<tmp){
      |                  ~~~~^~
/usr/include/time.h:76:15: note: declared here
   76 | extern time_t time (time_t *__timer) __THROW;
      |               ^~~~