Submission #9603

#	Time	Username	Problem	Language	Result	Execution time	Memory
9603		ksmail12	Your life (kriii2_Y)	C++98	0 / 4	20 ms	2216 KiB

Y

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

using namespace std;

vector<bool> v;

int find(vector<vector<int> > &g, queue<int> &q, int level, int n){
    if(q.empty()) return 0;
    int curr;

    queue<int> next;
    while(!q.empty()) {
        curr = q.front();
        q.pop();
        for(vector<int>::iterator it = g[curr].begin(); it!=g[curr].end();it++) {
            if(*it == n && v[*it] == false) {
                printf("%d\n", level+1);
                return level;
            }
            if(!v[*it] && *it != n) {
                v[*it] = true;
                next.push(*it);
            }
        }
    }
    return find(g, next, level+1, n);
}

int main() {
    vector<vector<int> > g;
    queue<int> q;
    int n, m;
    scanf("%d %d", &n, &m);
    if(n==1) {
        printf("0\n");
        return 0;
    }
    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);
    }
    // find solution
    q.push(1);
    v[1] = true;
    if(find(g, q, 0, n) == 0){
        printf("-1\n");
    }
    return 0;   
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 3