제출 #1057416

#제출 시각아이디문제언어결과실행 시간메모리
1057416Mr_HusanboyBouquet (EGOI24_bouquet)C++17
100 / 100
61 ms16260 KiB
//#pragma GCC optimize("Ofast,O3") //#pragma GCC target("avx,avx2") #include <bits/stdc++.h> using namespace std; #ifdef LOCAL #include "debugger.cpp" #else #define debug(...) #endif template<class T> int len(T &a){ return a.size(); } using ll = long long; using pii = pair<int,int>; #define all(a) (a).begin(), (a).end() #define ff first #define ss second string fileio = ""; mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); const int MOD = 1e9 + 7; const int inf = 1e9; const ll infl = 1e18; const int maxn = 1e5 + 1; void yesno(bool ok){ cout << (ok ? "Yes\n" : "No\n"); } struct SegmentTree{ int n; vector<int> t; SegmentTree (int n) : n(n), t(2 * n){} SegmentTree () {} int merge(int a, int b){ return max(a, b); } void upd(int i, int val){ i += n; t[i] = val; for(i /= 2; i > 0; i /= 2){ t[i] = merge(t[i * 2], t[i * 2 + 1]); } } int get(int l, int r){ l += n; r += n; int res = 0; while(l <= r){ if(l & 1){ res = merge(res, t[l ++]); } if(!(r & 1)){ res = merge(res, t[r --]); } l /= 2; r /= 2; } return res; } }; void solve(){ int n; cin >> n; vector<int> l(n), r(n); for(int i = 0; i< n; i ++){ cin >> l[i] >> r[i]; } SegmentTree t(n); vector<vector<pair<int,int>>> close(n); int mx = 0; for(int i = 0; i < n; i ++){ int res = t.get(0, i - l[i] - 1) + 1; mx = max(mx, res); if(i + r[i] < n){ close[i + r[i]].push_back({i, res}); } for(auto [j, val] : close[i]){ t.upd(j, val); } } cout << mx; } int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); auto start = chrono::high_resolution_clock::now(); #ifndef LOCAL if(fileio.size()){ freopen((fileio + ".in").c_str(), "r", stdin); freopen((fileio + ".out").c_str(), "w", stdout); } #endif int testcases = 1; #ifdef Tests cin >> testcases; #endif while(testcases --){ solve(); if(testcases) cout << '\n'; #ifdef LOCAL else cout << '\n'; cout << "_________________________" << endl; #endif } #ifdef LOCAL auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start); cout << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl; #endif return 0; }

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:102:10: warning: variable 'start' set but not used [-Wunused-but-set-variable]
  102 |     auto start = chrono::high_resolution_clock::now();
      |          ^~~~~
Main.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen((fileio + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen((fileio + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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