Submission #9697

#	Time	Username	Problem	Language	Result	Execution time	Memory
9697		silas	On grid (kriii2_O)	C++98	1 / 4	1000 ms	2392 KiB

O

#include <iostream>
#include <vector>
#include <string.h>
#define INF -987654321
using namespace std;

int R, C;
int  arr[303][303];
int  cache[303][303];

int psum_element(int y, int x, int val) {
	int ret = val;
	if (x - 1 >= 1) {
		ret += arr[y][x-1];
	}
	if (y - 1 >= 1) {
		ret += arr[y-1][x];
	}
	if (x - 1 >= 1 && y - 1>= 1)
		ret -= arr[y-1][x-1];
	return ret;
}

int area_sum(int ori_y, int ori_x, int sub_y, int sub_x) {
	int ret = 0;
	ret += arr[ori_y][ori_x];
	ret -= arr[ori_y][sub_x];
	ret -= arr[sub_y][ori_x];
	ret += arr[sub_y][sub_x];
	return ret;
}

int dp (int y, int x) {
	if (y == 0 || x == 0)
		return INF;
	if (y == 1)
		return arr[1][x];
	if (x == 1)
		return arr[y][1];
	int  &ret = cache[y][x];
	if (ret != -1)
		return ret;
	ret = INF;
	for (int i = y - 1; i >= 0; i--) {
		for (int j = x - 1; j >= 0; j--) {
			ret = max(ret, dp(i, j) + area_sum(y, x, i, j));
		}
	}
	ret = max(ret, arr[y][x]);
	return ret;
}

int main() {
	cin >> R >> C;
	memset(cache, -1, sizeof(cache));
	int temp;
	for (int i = 1 ; i <= R; i++) {
		for (int j = 1 ; j <= C; j++) {
			cin >> temp;
			arr[i][j] = psum_element(i, j, temp);
		}
	} // psum 2차원 배열을 완성
	cout << dp(R, C) << endl;


	return 0;
}

• Subtask 1: 1 / 1
• Subtask 2: 0 / 3