Submission #82417

#	Time	Username	Problem	Language	Result	Execution time	Memory
82417		farukkastamonuda	Ferries (NOI13_ferries)	C++14	40 / 40	323 ms	20360 KiB

ferries

#include <bits/stdc++.h>
#define fi first
#define se second
#define lo long long 
#define inf 1000000009
#define md 1000000007
#define li 100005
#define mp make_pair
#define pb push_back
#define mid (start+end)/2
using namespace std;
int n, m, x, y, z, d[li];
vector<int> v[li], t[li];
priority_queue< pair<int, int> > q;
void bfs(){
	for(int i = 1; i < n; i ++) d[i] = inf;
	q.push(mp(0, n));
	while(! q.empty()){
		pair<int, int> temp = q.top();
		q.pop();
		int cst = - temp.fi;
		int seh = temp.se;
		if(d[seh] != cst) continue;
		if(seh == 1){
			printf("%d\n", cst);
			exit(0);
		}
		for(int i = 0; i < (int)v[seh].size(); i ++){
			int ata = v[seh][i];
			if( ( int ) t[ata].size() > 0){
				int knr = t[ata].back();
				t[ata].pop_back();
				if(d[ata] > d[seh] + knr){
					d[ata] = d[seh] + knr;
					q.push(mp(- d[ata], ata));
				}
			}
		}
	}
}
int main(){
	scanf("%d %d", &n, &m);
	for(int i = 1; i <= m; i ++){
		scanf("%d %d %d", &x, &y, &z);
		v[y].pb(x);
		t[x].pb(z);
	}
	for(int i = 1;i <= n; i ++){
		sort(t[i].begin(), t[i].end());
	}
	bfs();
	return 0;
}

Compilation message (stderr)

ferries.cpp: In function 'int main()':
ferries.cpp:42:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
ferries.cpp:44:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d", &x, &y, &z);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12