제출 #1089510

#제출 시각아이디문제언어결과실행 시간메모리
1089510coolsentenceidontrememberCommuter Pass (JOI18_commuter_pass)C++17
0 / 100
137 ms19540 KiB
/* ;;;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::;;;;;;;;;;;;;;;;;;;:::::::::::::::::::::;;;;;;;;;;:::::::::::::;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;++++ ::::::::::::::::;S*.......+%:,....,*%,......,S+,,:;*%+:,..........,:*S##+.......+#SS:.......?@*.............%S:....;%;.....,%?%?,.....*%+?*:,,........,,:;?*,+S,......,S#?.......;S;.................... :::;;;::::::::::+S*.....,.+S;,,...,*%,......:S?;+*%S;......:?*,......+#@%,......:##S......,,S@*.......,,,,::%#?;,..,*%:.,...*#S;...,.;S*%*,.....,*%;......,%?*S,......,S#?.......;S;.................... ::::::::::::::::+S*.......+S;,,...,*%,......:#%???#?.......+@@;......,%@#;......,%@*.......;##*.......+#%%%%%%%?+,..,?%,.,..:#S,....:S?*%:.,....,S@?.,.....+S?S,......,S#?.......;S;.................... 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SS,...,,...,SS#;....:??*#*....,S%.....?%;:;;%S,...+#;.,.:#*.,..?@S,....+%?*?#;.,..:S*.....?#%,....*@+...,,::,....?%:,,+S;....:S+:,,:*S:....;%?*S%,...,:::,...:##?....:S+,;S;....:??*+S?.....%#,....%?,.. %#+........+#S#;.......,S#+,...::..,:*S?+++*SS,...+@*...;@*....?@%,........+@;....,,,....:%S%,....*S,....*##+....;S+,,+S;....:S+::::*S:.......,#*....,S#%,...,?@?....:S;.;S;........:#?.....%#,....%?,.. %SS********%#S#?********S##S?*++++*?SS%?????%S****?#S***S#%****%SS*********?#?*********??%?*%*****%S*****%%%?*****%*;;+%?****?%*;+;+*S?********#?****?S%%*****%#S*****%+:;%?*********S%*****%S*****%*::: */ #include"bits/stdc++.h" #pragma GCC optimize("O3", "unroll-loops") #define ll long long #define ld long double #define f first #define s second #define db double #define time_begin() auto begin = chrono::high_resolution_clock::now() #define time_end() auto end = chrono::high_resolution_clock::now(); auto elapsed = chrono::duration_cast<chrono::nanoseconds>(end-begin); auto sec = elapsed.count() * 1e-9; cerr << "\n\nExecution time: " << sec << " seconds"; #define check_time() cerr << "\nStatus : "; if (sec>1) cerr << "Time Limit Exceeded 1!!!1!111"; else cerr << "You good brother" #define precision(x) fixed << setprecision((x)) #define check_ok(s) cout << s << " is aight" << '\n' #define pii pair<int, int> #define mp make_pair using namespace std; void setIO(string s = ""){ ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); if (!s.empty()){ freopen((s+".in").c_str(), "r", stdin); freopen((s+".out").c_str(), "w", stdout); } } int n, m, s, t, u, v; const ll inf = 1e18; ll dis[2][100000], dp[2][100000]; ll d[100000]; vector<pii> adj[100000]; bool vis[100000]; ll ans; void dijkstra1(int start, int sign){ for (int i = 0; i < n; i++) dis[sign][i] = inf; dis[sign][start] = 0; priority_queue<pair<ll, int>> pq; pq.push(mp(0, start)); while (!pq.empty()){ ll cdis = -pq.top().f; int k = pq.top().s; pq.pop(); if (cdis > dis[sign][k]) continue; //cout << cdis << ' ' << k << '\n'; for (auto &[j, w] : adj[k]){ if (cdis + w < dis[sign][j]){ dis[j][sign] = cdis + w; pq.push(mp(-dis[sign][j], j)); } } } } void dijkstra2(int from, int to){ fill(&dp[0][0], &dp[0][0] + sizeof(dp)/sizeof(ll), inf); memset(vis, 0, sizeof vis); fill(d, d + 100000, inf); priority_queue<pair<ll, pii>> pq; pq.push(mp(0, mp(from, 0))); while (!pq.empty()){ pair<ll, pii> p = pq.top(); pq.pop(); ll cdis = -p.f; int k = p.s.f, par = p.s.s; if (cdis > d[k]) continue; d[k] = cdis; dp[0][k] = min(dis[0][k], dp[0][par]); dp[1][k] = min(dis[1][k], dp[1][par]); for (auto &[j, w] : adj[k]) pq.push(mp((ll)(-cdis - w), mp(j, k))); } } int main(){ cin >> n >> m >> s >> t >> u >> v; --s; --t; --u; --v; for (int i = 1; i <= m; i++){ int a, b, c; cin >> a >> b >> c; adj[--a].push_back(mp(--b, c)); adj[b].push_back(mp(a, c)); } dijkstra1(u, 0); dijkstra1(v, 1); ans = dis[0][v]; dijkstra2(s, t); ans = min(ans, dp[0][t]+ dp[1][t]); swap(s, t); dijkstra2(s, t); ans = min(ans, dp[0][t] + dp[1][t]); cout << ans; }

컴파일 시 표준 에러 (stderr) 메시지

commuter_pass.cpp: In function 'void setIO(std::string)':
commuter_pass.cpp:144:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  144 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:145:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  145 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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