Submission #1253957

#TimeUsernameProblemLanguageResultExecution timeMemory
1253957hoa208Jakarta Skyscrapers (APIO15_skyscraper)C++20
57 / 100
1098 ms52440 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 { ll w, u, t; bool operator < (const state &a) const { return w > a.w; } }; priority_queue<state> q; const ll BLOCK = 180; const ll N = 3e4 + 10; vector<ll> g[N]; ll n, m; ll dp[N][BLOCK + 10]; void hbmt() { cin >> n >> m; ll doge1 = 0; memset(dp, 0x3f, sizeof dp); FOR(i, 1, m) { ll b, p; cin >> b >> p; if(i == 1) { dp[b][0] = 0; q.push({0, b, 0}); } if(i == 2) { doge1 = b; } g[b].push_back(p); } while(!q.empty()) { ll u = q.top().u, du = q.top().w, t = q.top().t; q.pop(); if(du != dp[u][t]) continue; if(u == doge1) { cout << du; exit(0); } if(t != 0 && u + t < n) { if(dp[u + t][t] > dp[u][t] + 1) { dp[u + t][t] = dp[u][t] + 1; q.push({dp[u + t][t], u + t, t}); } } if(t != 0 && u - t >= 0) { if(dp[u - t][t] > dp[u][t] + 1) { dp[u - t][t] = dp[u][t] + 1; q.push({dp[u - t][t], u - t, t}); } } for(auto p : g[u]) { if(p > BLOCK) { ll c = 0; for(int v = u + p; v < n; v += p) { c++; if(dp[v][0] > dp[u][t] + c) { dp[v][0] = dp[u][t] + c; q.push({dp[v][0], v, 0}); } } c = 0; for(int v = u - p; v >= 0; v -= p) { c++; if(dp[v][0] > dp[u][t] + c) { dp[v][0] = dp[u][t] + c; q.push({dp[v][0], v, 0}); } } } else if(p != 0) { if(u + p < n) { if(dp[u + p][p] > dp[u][t] + 1) { dp[u + p][p] = dp[u][t] + 1; q.push({dp[u + p][p], u + p, p}); } } if(u - p >= 0) { if(dp[u - p][p] > dp[u][t] + 1) { dp[u - p][p] = dp[u][t] + 1; q.push({dp[u - p][p], u - p, p}); } } } } } 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; }

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:108:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  108 |         freopen("hbmt.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:109:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |         freopen("hbmt.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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