제출 #1253980

#제출 시각아이디문제언어결과실행 시간메모리
1253980hoa208Jakarta Skyscrapers (APIO15_skyscraper)C++20
100 / 100
64 ms24512 KiB
#include<bits/stdc++.h> using namespace std; #define ll long long #define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++) #define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--) #define pa pair<ll, ll> #define fi first #define se second #define bit(mask, j) ((mask >> j) & 1) #define t_test int t;cin >> t;while(t--) const ll mod = 1e9 + 7; const ll INF = 1e18; inline void adm(ll &x){if(x>=mod)x%=mod;else if(x<0)x+=mod;} //-------------------------------------------------------------------- struct state { int w, u; bool operator < (const state &a) const { return w > a.w; } }; priority_queue<state> q; const int BLOCK = 177; const int N = 3e4 + 10; vector<int> g[N]; int n, m; int dp[N], mark[N][BLOCK + 2]; void hbmt() { cin >> n >> m; int doge1 = 0; memset(dp, 0x3f, sizeof dp); FOR(i, 1, m) { int b, p; cin >> b >> p; if(i == 1) { dp[b] = 0; q.push({0, b}); } if(i == 2) { doge1 = b; } g[b].push_back(p); } while(!q.empty()) { int u = q.top().u, du = q.top().w; q.pop(); if(du != dp[u]) continue; if(u == doge1) { cout << du; exit(0); } for(auto p : g[u]) { int c = 0; for(int v = u + p; v < n; v += p) { c++; if(dp[v] > dp[u] + c) { dp[v] = dp[u] + c; q.push({dp[v], v}); } if(p <= BLOCK && mark[v][p]) break; if(p <= BLOCK) { mark[v][p] = true; } } c = 0; for(int v = u - p; v >= 0; v -= p) { c++; if(dp[v] > dp[u] + c) { dp[v] = dp[u] + c; q.push({dp[v], v}); } if(p <= BLOCK && mark[v][p]) break; if(p <= BLOCK) { mark[v][p] = true; } } } } cout << -1; } int main() { ios_base::sync_with_stdio(0); cin.tie(0);cout.tie(0); if(fopen("hbmt.inp", "r")) { freopen("hbmt.inp", "r", stdin); freopen("hbmt.out", "w", stdout); } // t_test hbmt(); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen("hbmt.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen("hbmt.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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