Submission #1292385

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292385		deh	Robot (JOI21_ho_t4)	C++20	0 / 100	92 ms	13296 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
using namespace std;
int n,m;
struct dataa{
    int ne,c,p;
};
vector<dataa>v[100005];
typedef pair<ll,int> pp;
ll d[100005],sum[200005];
int met[200005],tb;
void iswn(){
    cin >> n >> m;
    for(int i = 1;i <= m;i++){
        int x,y,ci,pi;cin >> x >> y >> ci >> pi;
        v[x].push_back({y,ci,pi});
        v[y].push_back({x,ci,pi});
    }
    for(int i = 1;i <= n;i++)d[i] = 1e17;
    d[1] = 0;
    priority_queue<pp,vector<pp>,greater<pp>>pq;
    pq.push({0,1});
    while(pq.size() != 0){
        ll dx = pq.top().f;
        int x = pq.top().s;
        pq.pop();
        if(dx != d[x])continue;
        tb++;
        int sc = 0;
        for(int i = 0;i < v[x].size();i++){
            int ci = v[x][i].c;
            ll pi = v[x][i].p;
            if(met[ci] != tb){
                sc++;
                met[ci] = tb;
                sum[ci] = 0;
            }
            sum[ci] += pi;
        }
        ll midel1 = 1e17;
        if(sc != m)midel1 = 0;
        else{
            for(int i = 0;i < v[x].size();i++){
                int ci = v[x][i].c;
                midel1 = min(midel1,sum[ci]);
            }
        }
        for(int i = 0;i < v[x].size();i++){
            int ci = v[x][i].c;
            ll pi = v[x][i].p;
            ll val = sum[ci]-pi;
            val = min(val,midel1+pi);
            int u = v[x][i].ne;
            if(d[u] > dx+val){
                d[u] = dx+val;
                pq.push({d[u],u});
            }
        }
    }
    if(d[n] == 1e17)cout << -1;
    else cout << d[n];
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if(fopen("ROBOT1.INP","r")){
        freopen("ROBOT1.INP","r",stdin);
        freopen("ROBOT1.OUT","w",stdout);
    }
    int ts = 1;//cin >> ts;
    while(ts--)iswn();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen("ROBOT1.INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen("ROBOT1.OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42