oj.uz

Submission #224148

# Submission time Handle Problem Language Result Execution time Memory
224148 2020-04-17T08:54:00 Z tqbfjotld Olympic Bus (JOI20_ho_t4) C++14
5 / 100
 100 ms 4592 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF 500000000000LL

int n,m;
int dist[205];
vector<pair<int,int> > adjl[205];
vector<pair<int,int> > rev[205];
int c[50005];
int d[50005];
int adjm[405][405];
vector<pair<pair<int,int>,int> > edges;

main(){
    scanf("%lld%lld",&n,&m);

    if (m<=1000 ){
        for (int x = 0; x<m; x++){
            int a,b;
            scanf("%lld%lld%lld%lld",&a,&b,&c[x],&d[x]);
            adjl[a].push_back({b,x});
            rev[b].push_back({a,x});
        }
        int fans = INF;
        for (int cov = -1; cov<m; cov++){
            priority_queue<pair<int,int>, vector<pair<int,int> >, greater<pair<int,int> > > pq;

            for (int x = 0; x<=n; x++){
                dist[x] = INF;
            }
            dist[1] = 0;
            pq.push({0,1});
            while (!pq.empty()){
                int d = pq.top().first;
                int node = pq.top().second;
                pq.pop();
                if (d>dist[node]) continue;
                for (auto x : adjl[node]){
                    if (x.second==cov) continue;
                    if (dist[node]+c[x.second]<dist[x.first]){
                        dist[x.first] = dist[node]+c[x.second];
                        pq.push({dist[x.first],x.first});
                    }
                }
                for (auto x : rev[node]){
                    if (x.second!=cov) continue;
                    if (dist[node]+c[x.second]<dist[x.first]){
                        dist[x.first] = dist[node]+c[x.second];
                        pq.push({dist[x.first],x.first});
                    }
                }
            }
            int ans = dist[n];
            if (ans==INF) continue;
            for (int x = 0; x<=n; x++){
                dist[x] = INF;
            }
            dist[n] = 0;
            pq.push({0,n});
            while (!pq.empty()){
                int d = pq.top().first;
                int node = pq.top().second;
                pq.pop();
                if (d>dist[node]) continue;
                for (auto x : adjl[node]){
                    if (x.second==cov) continue;
                    if (dist[node]+c[x.second]<dist[x.first]){
                        dist[x.first] = dist[node]+c[x.second];
                        pq.push({dist[x.first],x.first});
                    }
                }
                for (auto x : rev[node]){
                    if (x.second!=cov) continue;
                    if (dist[node]+c[x.second]<dist[x.first]){
                        dist[x.first] = dist[node]+c[x.second];
                        pq.push({dist[x.first],x.first});
                    }
                }
            }
            if (dist[1]==INF) continue;
            fans = min(fans,ans+dist[1]+d[cov]);
        }
        printf("%lld",fans==INF?-1:fans);
        return 0;
    }

    for (int x = 0; x<=2*n; x++){
        for (int y = 0; y<=2*n; y++){
            adjm[x][y] = INF;
            if (x==y) adjm[x][y] = 0;
        }
    }
    for (int x = 0; x<m; x++){
        int a,b,c,d;
        scanf("%lld%lld%lld%lld",&a,&b,&c,&d);
        adjm[a][b] = min(adjm[a][b],c);
        adjm[a+n][b+n] = min(adjm[a+n][b+n],c);
        adjm[b][a+n] = min(adjm[b][a+n],c+d);
        if (x&1)
        edges.push_back({{a,b},adjm[b][a+n]-c});
    }
    for (int k = 1; k<=2*n; k++){
        for (int i = 1; i<=2*n; i++){
            for (int j = 1; j<=2*n; j++){
                adjm[i][j] = min(adjm[i][j],adjm[i][k]+adjm[k][j]);
            }
        }
    }

    int ans1 = min(adjm[1][n]+adjm[n][1],adjm[1][2*n]+adjm[2*n][n+1]);
    ans1 = min(ans1,adjm[1][n]+adjm[n][n+1]);
    for (auto x : edges){
        int another = adjm[1][x.first.second]+x.second+adjm[x.first.first+n][n+n];
        another += adjm[n][x.first.second] +x.second + adjm[x.first.first+n][n+1];
        another -= x.second;
        ans1 = min(ans1,another);
    }
    assert(ans1>=0);
    printf("%lld",ans1>=INF?-1:ans1);
    return 0;
}

Compilation message

ho_t4.cpp:15:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld%lld",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~~~~
ho_t4.cpp:21:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%lld%lld%lld%lld",&a,&b,&c[x],&d[x]);
             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t4.cpp:96:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld%lld%lld%lld",&a,&b,&c,&d);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 59 ms 384 KB Output is correct
4 Correct 65 ms 384 KB Output is correct
5 Correct 21 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 9 ms 384 KB Output is correct
10 Correct 88 ms 384 KB Output is correct
11 Correct 89 ms 384 KB Output is correct
12 Correct 87 ms 384 KB Output is correct
13 Correct 27 ms 384 KB Output is correct
14 Correct 43 ms 384 KB Output is correct
15 Correct 15 ms 384 KB Output is correct
16 Correct 48 ms 384 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 100 ms 4592 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# 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 94 ms 2556 KB Output is correct
4 Correct 6 ms 384 KB Output is correct
5 Correct 98 ms 3196 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 97 ms 3196 KB Output is correct
9 Incorrect 98 ms 3324 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 59 ms 384 KB Output is correct
4 Correct 65 ms 384 KB Output is correct
5 Correct 21 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 9 ms 384 KB Output is correct
10 Correct 88 ms 384 KB Output is correct
11 Correct 89 ms 384 KB Output is correct
12 Correct 87 ms 384 KB Output is correct
13 Correct 27 ms 384 KB Output is correct
14 Correct 43 ms 384 KB Output is correct
15 Correct 15 ms 384 KB Output is correct
16 Correct 48 ms 384 KB Output is correct
17 Runtime error 100 ms 4592 KB Execution killed with signal 11 (could be triggered by violating memory limits)
18 Halted 0 ms 0 KB -