제출 #1126645

#제출 시각아이디문제언어결과실행 시간메모리
1126645SoMotThanhXuanCover (COCI18_cover)C++20
120 / 120
16 ms396 KiB
#include <bits/stdc++.h> using namespace std; #define FOR(i, a, b) for(int i = (a), _b = (b); i <= _b; ++i) #define REP(i, a, b) for(int i = (a), _b = (b); i >= _b; --i) #define mp make_pair #define all(v) v.begin(), v.end() #define uni(v) v.erase(unique(all(v)), v.end()) inline bool maximize(int &u, int v){ if(v > u){ u = v; return true; } return false; } inline bool minimize(int &u, int v){ if(v < u){ u = v; return true; } return false; } inline bool maximizell(long long &u, long long v){ if(v > u){ u = v; return true; } return false; } inline bool minimizell(long long &u, long long v){ if(v < u){ u = v; return true; } return false; } const int mod = 1e9 + 7; inline int fastPow(int a, int n){ int res = 1; while(n){ if(n & 1)res = 1ll * res * a * mod; a = 1ll * a * a % mod; n >>= 1; } return res; } inline void add(int &u, int v){ u += v; if(u >= mod) u -= mod; } inline void sub(int &u, int v){ u -= v; if(u < 0) u += mod; } const int maxN = 5e3 + 5; const int inf = 2e9; const long long infll = 1e18; pair<int, int> a[maxN]; long long f[maxN]; int n; void process(){ cin >> n; FOR(i, 1, n){ cin >> a[i].first >> a[i].second; a[i].first = abs(a[i].first); a[i].second = abs(a[i].second); } sort(a + 1, a + 1 + n); f[1] = 1ll * a[1].first * a[1].second; FOR(i, 2, n){ int Y = a[i].second; f[i] = infll; REP(j, i, 1){ maximize(Y, a[j].second); minimizell(f[i], f[j - 1] + 1ll * Y * a[i].first); } } cout << (f[n] << 2); } #define NAME "" int main(){ if(fopen(NAME".inp", "r")){ freopen(NAME".inp", "r", stdin); freopen(NAME".out", "w", stdout); } ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); int t = 1; // cin >> t; while(t--) process(); // cerr << '\n' << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << " s\n" ; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

cover.cpp: In function 'int main()':
cover.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
cover.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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