Submission #255485

#	Time	Username	Problem	Language	Result	Execution time	Memory
255485		shrek12357	Raisins (IOI09_raisins)	C++14	100 / 100	367 ms	20984 KiB

raisins

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <set>
#include <climits>
#include <cmath>
#include <fstream>
#include <queue>
using namespace std;

int pre[51][51];


int calc(int a, int b, int c, int d) {
	int ans = pre[c][d];
	if (a > 0) {
		ans -= pre[a - 1][d];
	}
	if (b > 0) {
		ans -= pre[c][b - 1];
	}
	if (a > 0 && b > 0) {
		ans += pre[a - 1][b - 1];
	}
	return ans;
}

int main() {
	int n, m;
	cin >> n >> m;
	int grid[51][51];
	int dp[51][51][51][51];
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> grid[i][j];
		}
	}
	pre[0][0] = grid[0][0];
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (i == 0 && j == 0) {
				continue;
			}
			if (i == 0) {
				pre[i][j] = pre[i][j - 1] + grid[i][j];
			}
			else if (j == 0) {
				pre[i][j] = pre[i - 1][j] + grid[i][j];
			}
			else {
				pre[i][j] = pre[i - 1][j] + pre[i][j - 1] - pre[i - 1][j - 1] + grid[i][j];
			}	
		}
	}
	for (int len1 = 0; len1 < n; len1++) {
		for (int len2 = 0; len2 < m; len2++) {
			for (int i = 0; i < n - len1; i++) {
				for (int j = 0; j < m - len2; j++) {
					if (len1 == 0 && len2 == 0) {
						dp[i][j][i + len1][j + len2] = 0;
					}
					else {
						dp[i][j][i + len1][j + len2] = INT_MAX;
						for (int a = 0; a < len1; a++) {
							dp[i][j][i + len1][j + len2] = min(dp[i][j][i + len1][j + len2], dp[i][j][i + a][j + len2] + dp[i + a + 1][j][i + len1][j + len2] + calc(i, j, i + len1, j + len2));
						}
						for (int a = 0; a < len2; a++) {
							dp[i][j][i + len1][j + len2] = min(dp[i][j][i + len1][j + len2], dp[i][j][i + len1][j + a] + dp[i][j + a + 1][i + len1][j + len2] + calc(i, j, i + len1, j + len2));
						}
					}
				}
			}
		}
	}
	cout << dp[0][0][n - 1][m - 1] << endl;
}

• Subtask 1: 100 / 100