Language: C

#include<iostream>#include<cstdio>#include<cstdlib>#include<string>#include<cstring>#include<cmath>#include<ctime>#include<algorithm>#include<utility>#include<stack>#include<queue>#include<vector>#include<set>#include<map>#include<bitset>#define EPS 1e-9#define PI acos(-1.0)#define INF 0x3f3f3f3f#define LL long longconst int MOD = 1E9+7;const int N = 100000+5;const int dx[] = {-1,1,0,0,-1,-1,1,1};const int dy[] = {0,0,-1,1,-1,1,-1,1};using namespace std;struct cmp{    bool operator()(const LL &a,const LL &b){        return a>b;    }};multiset<LL,cmp> s;int main() {    int n;    scanf("%d",&n);    for(int i=1;i<=n;i++){        LL x;        scanf("%lld",&x);        s.insert(x);    }     multiset<LL>::iterator it;    priority_queue<LL> Q;    LL maxx=0;    int num=0;    for(it=s.begin();it!=s.end();it++){        if(*it==maxx)            num++;        else{            maxx=*it;            num=1;        }        if(num>=2){            num=0;            Q.push(*it);        }    }    if(Q.size()<2)        printf("0\n");    else{        LL w=Q.top();Q.pop();        LL h=Q.top();Q.pop();        printf("%lld\n",w*h);    }    return 0;}

Compiler output:
main.c:1:19: warning: extra tokens at end of #include directive
    1 | #include<iostream>#include<cstdio>#include<cstdlib>#include<string>#include<cstring>#include<cmath>#include<ctime>#include<algorithm>#include<utility>#include<stack>#include<queue>#include<vector>#include<set>#include<map>#include<bitset>#define EPS 1e-9#define PI acos(-1.0)#define INF 0x3f3f3f3f#define LL long longconst int MOD = 1E9+7;const int N = 100000+5;const int dx[] = {-1,1,0,0,-1,-1,1,1};const int dy[] = {0,0,-1,1,-1,1,-1,1};using namespace std;struct cmp{    bool operator()(const LL &a,const LL &b){        return a>b;    }};multiset<LL,cmp> s;int main() {    int n;    scanf("%d",&n);    for(int i=1;i<=n;i++){        LL x;        scanf("%lld",&x);        s.insert(x);    }     multiset<LL>::iterator it;    priority_queue<LL> Q;    LL maxx=0;    int num=0;    for(it=s.begin();it!=s.end();it++){        if(*it==maxx)            num++;        else{            maxx=*it;            num=1;        }        if(num>=2){            num=0;            Q.push(*it);        }    }    if(Q.size()<2)        printf("0\n");    else{        LL w=Q.top();Q.pop();        LL h=Q.top();Q.pop();        printf("%lld\n",w*h);    }    return 0;}
      |                   ^
main.c:1:9: fatal error: iostream: No such file or directory
    1 | #include<iostream>#include<cstdio>#include<cstdlib>#include<string>#include<cstring>#include<cmath>#include<ctime>#include<algorithm>#include<utility>#include<stack>#include<queue>#include<vector>#include<set>#include<map>#include<bitset>#define EPS 1e-9#define PI acos(-1.0)#define INF 0x3f3f3f3f#define LL long longconst int MOD = 1E9+7;const int N = 100000+5;const int dx[] = {-1,1,0,0,-1,-1,1,1};const int dy[] = {0,0,-1,1,-1,1,-1,1};using namespace std;struct cmp{    bool operator()(const LL &a,const LL &b){        return a>b;    }};multiset<LL,cmp> s;int main() {    int n;    scanf("%d",&n);    for(int i=1;i<=n;i++){        LL x;        scanf("%lld",&x);        s.insert(x);    }     multiset<LL>::iterator it;    priority_queue<LL> Q;    LL maxx=0;    int num=0;    for(it=s.begin();it!=s.end();it++){        if(*it==maxx)            num++;        else{            maxx=*it;            num=1;        }        if(num>=2){            num=0;            Q.push(*it);        }    }    if(Q.size()<2)        printf("0\n");    else{        LL w=Q.top();Q.pop();        LL h=Q.top();Q.pop();        printf("%lld\n",w*h);    }    return 0;}
      |         ^~~~~~~~~~
compilation terminated.