洛谷 P1854 花店橱窗布置

花店橱窗布置

里程碑式的一题！

第一次完全未看题解做出的一道dp题

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Code:

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
//Mystery_Sky
//
#define M 500
#define INF 0x3f3f3f3f
int f[M][M], a[M][M];
int n, m;

void print(int x, int y)
{
	if(x == 0) return;
	for(int i = 1; i <= y; i++) {
		if(f[x][y] - a[x][i] == f[x-1][i-1]) {
			print(x-1, i-1);
			printf("%d ", i);
			break;
		}
	}
	return;
}

int main() {
	scanf("%d%d", &n, &m);
	memset(f, -INF, sizeof(f));
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= m; j++) {
			scanf("%d", &a[i][j]);
		}
	}
	f[0][0] = 0;
	for(int i = 1; i <= m; i++) f[1][i] = max(f[1][i-1], a[1][i]), f[0][i] = 0;
	for(int i = 1; i <= n; i++) {
		for(int j = i; j <= m; j++) {
			for(int k = i; k <= j; k++) {
				f[i][j] = max(f[i][j], f[i-1][k-1] + a[i][k]);				
			}
		}
	}
	printf("%d
", f[n][m]);
	print(n, m);
	return 0;
}