Ruudukko

input/code.cpp: In function 'int main()':
input/code.cpp:18:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<now.size();i++){
                ^

#include<bits/stdc++.h>
using namespace std;
int main(){
	cin.sync_with_stdio(false);
	int n;
	vector < pair < int,int > > next;
	vector < pair < int,int > > now;
	char c='Z'+1;
	int m=0;
	cin>>n;
	string s[n];
	for(int i=0;i<n;i++){
		cin>>s[i];
	}
	now.push_back(pair< int,int> (0,0));
	int x,y;
	while(m<n*2){
		for(int i=0;i<now.size();i++){
			x=now[i].first;
			y=now[i].second;
			if(s[y][x]<c){
				next.clear();
				c=s[y][x];
			}
			if(s[y][x]==c){
				if(x!=n-1){
					next.push_back(pair< int,int> (x+1,y));
				}
				if(y!=n-1){
					next.push_back(pair< int,int> (x,y+1));
                                }
			}
		}
		if(now.size()==0){
			break;
		}
		cout<<c;
		c='Z'+1;
		m++;
		now=next;
		vector < pair< int,int> > next;
	}
	cout<<"\n";
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED