제출 #134760

#제출 시각아이디문제언어결과실행 시간메모리
134760Mahdi_JfriRoller Coaster Railroad (IOI16_railroad)C++14
0 / 100
106 ms30716 KiB
#include "railroad.h" #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back #define bit(a , b) (((a)>>(b))&1) const int maxn = 2e5 + 20; const int maxm = (1 << 16) + 20; int s[maxn] , t[maxn] , n; ll dp[maxm][20]; bool has[20]; long long plan_roller_coaster(vector<int> S, vector<int> T) { n = (int)S.size(); for(int i = 0; i < n; i++) s[i] = S[i] , t[i] = T[i]; memset(dp , 63 , sizeof dp); int hlp = (1 << n) , mn = 0; for(int mask = 1; mask < hlp; mask++) { memset(has , 0 , sizeof has); for(int i = 0; i < n; i++) { if(bit(mask , i)) { for(int j = 0; j < n; j++) if(i != j && s[j] <= t[i]) has[j] = 1; if(mask == (1 << i)) { dp[mask][i] = 0; break; } for(int j = 0; j < n; j++) if(bit(mask ^ (1 << i) , j)) dp[mask][i] = min(dp[mask][i] , dp[mask ^ (1 << i)][j] + max(0 , t[j] - s[i])); } } int cnt = 0; for(int j = 0; j < n; j++) cnt += has[j]; cnt -= __builtin_popcount(mask); mn = min(mn , cnt); } int ans = *min_element(dp[hlp - 1] , dp[hlp - 1] + n); // while(ans == 0 && mn < -1); return ans; }
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