제출 #689028

#제출 시각아이디문제언어결과실행 시간메모리
689028JooDdaeRobot (JOI21_ho_t4)C++17
0 / 100
3094 ms124488 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; const ll INF = 1e18; int n, m, c[200200], p[200200]; map<int, vector<array<int, 2>>> v1[100100], v2[100100]; map<int, ll> s[100100]; map<int, array<ll, 2>> d[100100]; priority_queue<array<ll, 4>, vector<array<ll, 4>>, greater<>> pq; int main(){ cin.tie(0)->sync_with_stdio(0); cin >> n >> m; for(int i=1;i<=m;i++) { int x, y; cin >> x >> y >> c[i] >> p[i]; s[x][c[i]] += p[i], s[y][c[i]] += p[i], d[x][i] = d[y][i] = {INF, INF}; v1[x][c[i]].push_back({y, i}), v1[y][c[i]].push_back({x, i}); v2[x][c[i]].push_back({y, i}), v2[y][c[i]].push_back({x, i}); } pq.push({0, 1, -1, 0}); while(!pq.empty()) { auto [cost, u, id, type] = pq.top(); pq.pop(); if(d[u][id][type] < cost) continue; if(u == n) return cout << cost, 0; for(auto [xcol, v] : v1[u]) { ll S = s[u][xcol]; for(auto [x, y] : v) { ll C1 = cost + S - p[y], C2 = cost + p[y]; if((!type || c[id] != xcol) && C1 < d[x][y][1]) d[x][y][1] = C1, pq.push({C1, x, y, 1}); if(C2 < d[x][y][0]) d[x][y][0] = C2, pq.push({C2, x, y, 0}); } } // 변경된 색으로 들어와서 변경되기 전 색과 같은 간선의 색을 그대로 나가는 처리 if(type == 1) continue; auto &v = v2[u][c[id]]; ll S = s[u][c[id]]; for(auto [x, y] : v) if(y != id) { ll C = cost + S - p[y] - p[id]; if(C < d[x][y][1]) d[x][y][1] = C, pq.push({C, x, y, 1}); } v2[u].erase(c[id]); } cout << -1; }
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