Submission #382738

#TimeUsernameProblemLanguageResultExecution timeMemory
382738jainbot27Robot (JOI21_ho_t4)C++17
100 / 100
592 ms73164 KiB
#include <bits/stdc++.h> #define va first #define vb second using namespace std; typedef long long lint; typedef pair<int, int> pint; typedef pair<lint, lint> plint; const int MAX = 4e5 + 10; int n, m; lint D[MAX]; vector<int> A; vector<plint> G[MAX]; vector<pair<int, pint>> V[MAX]; int main() { cin.tie(0); ios_base::sync_with_stdio(0); cin >> n >> m; for (int i = 0; i < m; i++) { int a, b, c, p; cin >> a >> b >> c >> p; V[a].push_back({ c, {p, b} }); V[b].push_back({ c, {p, a} }); } int sz = n; for (int i = 1; i < n; i++) { if (V[i].empty()) continue; sort(V[i].begin(), V[i].end()); for (int l = 0, r = 0; l < V[i].size(); l = r) { lint s = 0; while (r < V[i].size() && V[i][l].va == V[i][r].va) s += V[i][r++].vb.va; if (r - l == 1) G[i].emplace_back(0, V[i][l].vb.vb); else { G[i].emplace_back(0, ++sz); for (int j = l; j < r; j++) { pint x = V[i][j].vb; G[i].emplace_back(x); G[x.vb].emplace_back(0, sz); G[sz].emplace_back(s - x.va, x.vb); } } } } priority_queue<plint> Q; Q.emplace(0, 1); for (int i = 1; i <= sz; i++) D[i] = 4e18; while (!Q.empty()) { auto t = Q.top(); Q.pop(); if (D[t.vb] != 4e18) continue; D[t.vb] = -t.va; for (auto nxt : G[t.vb]) Q.emplace(t.va - nxt.va, nxt.vb); } cout << (D[n] == 4e18 ? -1 : D[n]); }

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:25:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   25 |         if (V[i].empty()) continue; sort(V[i].begin(), V[i].end());
      |         ^~
Main.cpp:25:37: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   25 |         if (V[i].empty()) continue; sort(V[i].begin(), V[i].end());
      |                                     ^~~~
Main.cpp:26:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         for (int l = 0, r = 0; l < V[i].size(); l = r) {
      |                                ~~^~~~~~~~~~~~~
Main.cpp:28:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |             while (r < V[i].size() && V[i][l].va == V[i][r].va) s += V[i][r++].vb.va;
      |                    ~~^~~~~~~~~~~~~
Main.cpp:45:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   45 |         if (D[t.vb] != 4e18) continue; D[t.vb] = -t.va;
      |         ^~
Main.cpp:45:40: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   45 |         if (D[t.vb] != 4e18) continue; D[t.vb] = -t.va;
      |                                        ^
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