#include #define ll long long #define fi first #define se second #define show(x) cout<<#x<<"="<>n>>m; for(int i=0;i>a[i][j]; if(i!=0)a[i][j]+=a[i-1][j]; } } for(int i=0;i777){ if(r==l){ break; } sum-=a[i][l]; l++; } sum+=a[i][r]; r++; } } if(sum==777){ cout<<"YES"<<"\n"; return 0; } } cout<<"NO"<<"\n"; #ifdef LOCAL_DEFINE cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n"; #endif return 0; }