Submission #9440

#	Time	Username	Problem	Language	Result	Execution time	Memory
9440		ksmail12	Your life (kriii2_Y)	C++98	0 / 4	0 ms	1684 KiB

Y

#include <iostream>
#include <cstdio>
#include <vector>
#include <queue>

using namespace std;

int main() {
    vector<vector<int> > g;
    vector<bool> v;
    queue<int> q;
    int n, m;
    int count = 0;
    scanf("%d %d", &n, &m);
    g.resize(n+1);
    v.resize(n+1);
    // make graph
    for (int i=m;i!=0;i--) {
        int x,y;
        scanf("%d %d", &x, &y);
        g[x].push_back(y);
    }
//    cout << "queue init start\n";
    // find solution
    q.push(1);
    v[1] = true;
//    cout << "queue init\n";
    while(!q.empty()) {
        int curr = q.front();
//        cout << "curr "<< curr << endl;
        
        q.pop();
        for(vector<int>::iterator it = g[curr].begin(); it!=g[curr].end();it++) {
            if(*it == n) {
                printf("%d\n", count+1);
                return 0;
            }
            if(!v[*it] && *it != n) {
                v[*it] = true;
                q.push(*it);
            }
        }

        count++;
    }
    if(!v[n])
        printf("-1\n");

    if(count == 0)
        printf("0\n");
    return 0;   
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 3