oj.uz

Submission #224106

# Submission time Handle Problem Language Result Execution time Memory
224106 2020-04-17T08:09:17 Z dantoh000 Olympic Bus (JOI20_ho_t4) C++14
5 / 100
 1000 ms 1796 KB 
#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> ii;
typedef pair<int,ii> iii;
typedef pair<ii,ii> i4;
i4 G[50005];
vector<ii> adjlist[205];
int ans = 2000000000;
int n,m;
int dist[205];
priority_queue<ii,vector<ii>, greater<ii> > pq;
int test(){
    for (int i = 1; i <= n; i++) adjlist[i].clear();
    for (int i = 0; i < m; i++){
        int u = G[i].first.first;
        int v = G[i].first.second;
        int c = G[i].second.first;
        adjlist[u].push_back({v,c});
    }
    memset(dist,-1,sizeof(dist));
    dist[1] = 0;
    pq.push({0,1});
    while (pq.size()){
        ii cur = pq.top(); pq.pop();
        int d = cur.first, u = cur.second;
        if (dist[u] < d) continue;
        for (auto v: adjlist[u]){
            int newdist = dist[u]+v.second;
            if (dist[v.first] == -1 || newdist < dist[v.first]){
                dist[v.first] = newdist;
                pq.push({dist[v.first],v.first});
            }
        }
    }
    int L = dist[n];
    memset(dist,-1,sizeof(dist));
    dist[n] = 0;
    pq.push({0,n});
    while (pq.size()){
        ii cur = pq.top(); pq.pop();
        int d = cur.first, u = cur.second;
        if (dist[u] < d) continue;
        for (auto v: adjlist[u]){
            int newdist = dist[u]+v.second;
            if (dist[v.first] == -1 || newdist < dist[v.first]){
                dist[v.first] = newdist;
                pq.push({dist[v.first],v.first});
            }
        }
    }
    int R = dist[1];
    if (L == -1 || R == -1) return -1;
    else return L+R;
}

int main(){
    scanf("%d%d",&n,&m);
    for (int i = 0; i < m; i++){
        int u,v,c,d;
        scanf("%d%d%d%d",&u,&v,&c,&d);
        G[i].first.first = u;
        G[i].first.second = v;
        G[i].second.first = c;
        G[i].second.second = d;
    }
    int x = test();
    //printf("noflip, %d\n",x);
    if (x != -1) ans = min(ans,x);
    for (int i = 0; i<  m; i++){
        int cost = G[i].second.second;
        swap(G[i].first.first,G[i].first.second);
        int r = test();
        swap(G[i].first.first,G[i].first.second);
        //printf("%d %d\n",cost,r);
        if (r == -1) continue;
        ans = min(ans,cost+r);
    }
    if (ans == 2000000000){
        printf("-1");
        return 0;
    }
    else printf("%d \n",ans);


}

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:57:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
ho_t4.cpp:60:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d%d",&u,&v,&c,&d);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 63 ms 504 KB Output is correct
4 Correct 67 ms 384 KB Output is correct
5 Correct 27 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 18 ms 512 KB Output is correct
10 Correct 89 ms 384 KB Output is correct
11 Correct 87 ms 384 KB Output is correct
12 Correct 88 ms 384 KB Output is correct
13 Correct 39 ms 384 KB Output is correct
14 Correct 49 ms 384 KB Output is correct
15 Correct 45 ms 384 KB Output is correct
16 Correct 46 ms 384 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1084 ms 1796 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 384 KB Output is correct
2 Correct 6 ms 384 KB Output is correct
3 Execution timed out 1083 ms 1408 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 63 ms 504 KB Output is correct
4 Correct 67 ms 384 KB Output is correct
5 Correct 27 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 18 ms 512 KB Output is correct
10 Correct 89 ms 384 KB Output is correct
11 Correct 87 ms 384 KB Output is correct
12 Correct 88 ms 384 KB Output is correct
13 Correct 39 ms 384 KB Output is correct
14 Correct 49 ms 384 KB Output is correct
15 Correct 45 ms 384 KB Output is correct
16 Correct 46 ms 384 KB Output is correct
17 Execution timed out 1084 ms 1796 KB Time limit exceeded
18 Halted 0 ms 0 KB -