제출 #1118337

#제출 시각아이디문제언어결과실행 시간메모리
1118337gdragonEvacuation plan (IZhO18_plan)C++17
0 / 100
319 ms30552 KiB
#include <bits/stdc++.h> using namespace std; #define TASK "long" #define fi first #define se second #define ll long long #define pb push_back #define ALL(x) (x).begin(), (x).end() #define GETBIT(mask, i) ((mask) >> (i) & 1) #define MASK(i) ((1LL) << (i)) #define SZ(x) ((int)(x).size()) #define mp make_pair #define CNTBIT(mask) __builtin_popcount(mask) template<class X, class Y> bool maximize(X &x, Y y){ if (x < y) {x = y; return true;} return false;}; template<class X, class Y> bool minimize(X &x, Y y){ if (x > y) {x = y; return true;} return false;}; typedef pair<int, int> ii; const int N = 1e5 + 5; const int M = 5e5 + 5; const int inf = 1e9 + 7; const long long INF = (long long)1e18 + 7; const int mod = 1e9 + 7; vector<ii> adj[N]; int n, m, q, numNpp; vector<int> Npps, val; int d[N]; void read() { cin >> n >> m; for(int i = 1; i <= m; i++) { int u, v, c; cin >> u >> v >> c; adj[u].push_back({v, c}); adj[v].push_back({u, c}); } cin >> numNpp; Npps.assign(numNpp, 0); for(int &i: Npps) cin >> i; } void calDistToNpp() { priority_queue<ii, vector<ii>, greater<ii>> heap; memset(d, 0x3f, sizeof(d)); for(int i: Npps) { heap.push({0, i}); d[i] = 0; } while(!heap.empty()) { ii tmp = heap.top(); heap.pop(); int u = tmp.se; int du = tmp.fi; if (du != d[u]) continue; for(auto [v, c]: adj[u]) { if (minimize(d[v], d[u] + c)) { heap.push(mp(d[v], v)); } } } } bool vis[N]; bool dfs(int u, int t, int lim) { if (u == t) return true; if (vis[u]) return false; vis[u] = 1; for(auto [v, c]: adj[u]) if (d[v] >= lim) { if (dfs(v, t, lim)) return true; } return false; } bool check(int s, int t, int lim) { fill(vis + 1, vis + n + 1, 0); return dfs(s, t, lim); } void solve() { calDistToNpp(); for(int i = 1; i <= n; i++) val.push_back(d[i]); sort(ALL(val)); val.erase(unique(ALL(val)), val.end()); cin >> q; while(q--) { int s, t; cin >> s >> t; if (d[s] == 0 || d[t] == 0) { cout << 0 << endl; continue; } int l = 0, r = SZ(val) - 1, ans = 0; while(l <= r) { int mid = (l + r) >> 1; if (check(s, t, val[mid])) { ans = val[mid]; l = mid + 1; } else r = mid - 1; } cout << ans << endl; } } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen(TASK".inp", "r")) { freopen(TASK".inp", "r", stdin); freopen(TASK".out", "w", stdout); } int test = 1; // cin >> test; while(test--) { read(); solve(); } return 0; } // rmq - rmq2d // hash // fw - fw2d // segtree

컴파일 시 표준 에러 (stderr) 메시지

plan.cpp: In function 'int main()':
plan.cpp:97:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   97 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
plan.cpp:98:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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