Submission #1000971
Source Code Expand
#include <iostream> #include <iomanip> #include <cstdio> #include <cstdlib> #include <algorithm> #include <numeric> #include <random> #include <vector> #include <array> #include <bitset> #include <queue> #include <set> #include <unordered_set> #include <map> #include <unordered_map> using namespace std; using ll = long long; using ull = unsigned long long; constexpr ll TEN(int n) { return (n==0) ? 1 : 10*TEN(n-1); } int bsr(int x) { return 31 - __builtin_clz(x); } const int MN = 5050; using P = pair<ll, ll>; int n; vector<P> v; ll dp[MN][MN]; bool used[MN][MN]; ll calc(int m, int a) { if (m == 0) return 0; int b = n/2 - ((n-m)-(n/2-a)); if (used[m][a]) return dp[m][a]; used[m][a] = true; ll &ans = dp[m][a]; ans = TEN(18); P p = v[m-1]; // left if (a) { ll x = p.first*(a-1); x += p.second*(a); ans = min(ans, x + calc(m-1, a-1)); } // right if (b) { ll x = p.first*(b); x += p.second*(b-1); ans = min(ans, x + calc(m-1, a)); } return ans; } ll main2() { memset(used, false, sizeof(used)); ll ans = 0; if (n % 2 == 1) { // 演算子の優先順位には…気をつけようね! ans += (v[n-1].first+v[n-1].second)*(n/2); n--; } return ans + calc(n, n/2); } int main() { ios::sync_with_stdio(0); cout << setprecision(20); int nn; cin >> nn; n = nn; for (int i = 0; i < n; i++) { ll l, r; cin >> l >> r; v.push_back(P(l, r)); } ll ans = TEN(18); sort(v.begin(), v.end(), [&](const P l, const P r){ ll ls = l.first+l.second; ll rs = r.first+r.second; if (ls != rs) return ls > rs; return l.first > r.first; }); ans = min(ans, main2()); n = nn; sort(v.begin(), v.end(), [&](const P l, const P r){ ll ls = l.first+l.second; ll rs = r.first+r.second; if (ls != rs) return ls > rs; return l.second > r.second; }); ans = min(ans, main2()); cout << ans << endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | F - Intervals |
User | yosupo |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 2184 Byte |
Status | CE |
Compile Error
./Main.cpp: In function ‘ll main2()’: ./Main.cpp:54:37: error: ‘memset’ was not declared in this scope memset(used, false, sizeof(used)); ^