제출 #516365

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
516365		XII	Robot (JOI21_ho_t4)	C++17	0 / 100	181 ms	39888 KiB

Main

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

#define fi first
#define se second
#define mp make_pair
#define eb emplace_back
#define ALL(x) (x).begin(), (x).end()

#define FOR(i, a, b) for(int i = (a); i < (b); ++i)
#define FORU(i, a, b) for(int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)

#define IOS cin.tie(0)->sync_with_stdio(false);
#define PROB "QG04PAINT"
void Fi(){
    if(fopen(PROB".inp", "r")){
        freopen(PROB".inp", "r", stdin);
        freopen(PROB".out", "w", stdout);
    }
}

const int N = 1e5 + 1;
int n, m;
using pi = pair<int, int>;
map<int, vector<pi>> adj[N];
map<int, bool> vis[N];
map<int, ll> sum[N];
map<int, ll> d[N];

using node = pair<ll, pair<int, int>>;
priority_queue<node, vector<node>, greater<node>> pq;
void dijkstra(){
    pq.emplace(0, mp(1, 0));
    d[1][0] = 0;
    while(!pq.empty()){
        ll wu = pq.top().fi;
        auto [u, c] = pq.top().se;
        pq.pop();
        if(wu != d[u][c] || vis[u][c]) continue;
        vis[u][c] = true;
//        cout << u << " " << c << " " << wu << "?\n";
        if(c){
            for(pi ed: adj[u][c]){
                if(d[ed.fi][0] > wu + (sum[u][c] - ed.se)){
                    d[ed.fi][0] = wu + (sum[u][c] - ed.se);
                    pq.emplace(d[ed.fi][0], mp(ed.fi, 0));
                }
            }
        } else{
            for(auto arr: adj[u]){
                for(pi ed: arr.se){
                    ll tmp = wu + min(1LL * ed.se, sum[u][arr.fi] - ed.se);
                    if(!d[ed.fi].count(0) || d[ed.fi][0] > tmp){
                        d[ed.fi][0] = tmp;
                        pq.emplace(d[ed.fi][0], mp(ed.fi, 0));
                    }
                    if(!d[ed.se].count(arr.fi) || d[ed.fi][arr.fi] > wu){
                        d[ed.fi][arr.fi] = wu;
                        pq.emplace(d[ed.fi][arr.fi], mp(ed.fi, arr.fi));
                    }
                }
            }
        }
    }
}

int main(){
    IOS;
    Fi();
    cin >> n >> m;
    FORU(i, 1, m){
        int u, v, c, p;
        cin >> u >> v >> c >> p;
        adj[u][c].eb(v, p);
        adj[v][c].eb(u, p);
        sum[u][c] += p;
        sum[v][c] += p;
    }
    dijkstra();
    if(d[n].count(0)) cout << d[n][0];
    else cout << "-1";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'void Fi()':
Main.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(PROB".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen(PROB".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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