Submission #9167

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
9167	2014-09-28T04:17:11 Z	altertain	Your life (kriii2_Y)	C++14	4 / 4	76 ms	7580 KB

Y

#include <vector>
#include <map>
#include <set>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <string>
#include <cctype>
#include <cstring>
#include <queue>
#include <cassert>

using namespace std;

typedef long long LL;
typedef vector<string> VS;
typedef vector<int> VI;
typedef pair<int,int> PII;
typedef vector<PII> VPII;

#define MP make_pair
#define ST first
#define ND second
#define PB push_back
#define FOR(i,a,b) for( int i=(a); i<(b); ++i)
#define FORD(i,a,b) for( int i=(a); i>(b); --i)
#define REP(i,n) for(int i=0; i<(n); ++i)
#define ALL(X) (X).begin(),(X).end()
#define SZ(X) (int)(X).size()
#define FORE(it,X) for(__typeof((X).begin()) it=(X).begin(); it!=(X).end();++it)

int dy[100005];
VI dt[100005];
int n,m;

int main()
{
	cin>>n>>m;
	
	REP(i, m) {
		int a,b;
		scanf("%d%d",&a,&b);
		a--,b--;
		dt[a].PB(b);
	}

	dy[0]=1;
	REP(i, n) if (dy[i]) {
		REP(j, SZ(dt[i])) {
			int v= dt[i][j];
			if (dy[v]) dy[v] = min(dy[v], dy[i]+1);
			else dy[v] = dy[i]+1;
		}
	}

	if (dy[n-1] == 0) cout<<-1<<endl;
	else cout<<dy[n-1]-1<<endl;
	return 0;
}

Subtask #1

1.0 / 1.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	4412 KB	Output is correct
2	Correct	0 ms	4412 KB	Output is correct
3	Correct	0 ms	4412 KB	Output is correct
4	Correct	0 ms	4412 KB	Output is correct
5	Correct	0 ms	4412 KB	Output is correct
6	Correct	0 ms	4412 KB	Output is correct
7	Correct	0 ms	4412 KB	Output is correct
8	Correct	0 ms	4412 KB	Output is correct
9	Correct	0 ms	4412 KB	Output is correct
10	Correct	16 ms	4948 KB	Output is correct

Subtask #2

3.0 / 3.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	4412 KB	Output is correct
2	Correct	28 ms	7448 KB	Output is correct
3	Correct	56 ms	7448 KB	Output is correct
4	Correct	52 ms	7448 KB	Output is correct
5	Correct	56 ms	7448 KB	Output is correct
6	Correct	16 ms	7448 KB	Output is correct
7	Correct	44 ms	7448 KB	Output is correct
8	Correct	76 ms	7580 KB	Output is correct
9	Correct	32 ms	7448 KB	Output is correct
10	Correct	64 ms	7184 KB	Output is correct