Submission #797776

#TimeUsernameProblemLanguageResultExecution timeMemory
797776LiudasRaisins (IOI09_raisins)C++17
100 / 100
942 ms55380 KiB
#include <bits/stdc++.h> using namespace std; long long ans = 0; long long calc(int a, int b, int c, int d, vector<vector<long long>> &pref){ return pref[c][d] - pref[c][b] - pref[a][d] + pref[a][b]; } long long split(int a, int b, int c, int d, vector<vector<long long>> &arr, vector<vector<vector<vector<long long>>>> &best, vector<vector<long long>> &pref){ if(best[a][b][c-1][d-1] < 2e12){ return best[a][b][c-1][d-1]; } if(c-a==1 && d-b==1){ best[a][b][c-1][d-1] = 0; return 0; } for(int i = a + 1; i < c; i ++){ best[a][b][c-1][d-1] = min(best[a][b][c-1][d-1], split(a,b,i,d,arr,best,pref) + split(i,b,c,d,arr,best,pref) + calc(a,b,c,d,pref)); } for(int i = b + 1; i < d; i ++){ best[a][b][c-1][d-1] = min(best[a][b][c-1][d-1], split(a,b,c,i,arr,best,pref) + split(a,i,c,d,arr,best,pref) + calc(a,b,c,d,pref)); } return best[a][b][c-1][d-1]; } int main() { int N, M; cin >> N >> M; vector<vector<long long>> arr(N, vector<long long> (M)), pref(N+5, vector<long long>(M + 5, 0)); vector<vector<vector<vector<long long>>>> best(N, vector<vector<vector<long long>>>(M, vector<vector<long long>>(N, vector<long long>(M, 2e12)))); for(int i = 0; i < N; i ++){ for(int j = 0; j < M; j ++){ cin >> arr[i][j]; } } for(int i = 0; i < N; i ++){ for(int j = 0; j < M; j ++){ pref[i + 1][j + 1] = arr[i][j] + pref[i][j+1] + pref[i + 1][j] - pref[i][j]; } } cout << split(0, 0, N, M, arr, best, pref) << endl; return 0; }
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