【DP】 HDOJ 4804 Campus Design

来源：互联网发布：网络用语打call的意思编辑：程序博客网时间：2024/06/03 19:42

轮廓线dp一下就行了。。和大白书上的轮廓线dp类似。。。

#include <bits/stdc++.h>using namespace std;typedef long long LL;const int maxn = 105;const int mod = 1e9+7;char g[maxn][11];int dp[2][1 << 10][22];int n, m, C, D;void add(int& x, int y){x += y;if(x > mod) x -= mod;}void work(){memset(g, '1', sizeof g);for(int i = 1; i <= n; i++) scanf("%s", g[i]+1);memset(dp, 0, sizeof dp);int now = 1, pre = 0;dp[now][(1 << m) - 1][0] = 1;int tt = (1 << m) - 1;for(int i = 1; i <= n; i++) {for(int j = 1; j <= m; j++) {now ^= 1;pre ^= 1;memset(dp[now], 0, sizeof dp[now]);for(int k = 0; k < 1 << m; k++) {for(int l = 0; l <= D; l++) {if(g[i][j] == '0') {if(g[i-1][j] == '0') {if((k & (1 << m-1)) == 0) add(dp[now][k << 1 & tt][l], dp[pre][k][l]);}else {if((k & (1 << m-1)) != 0) add(dp[now][k << 1 & tt][l], dp[pre][k][l]);}}else {if(g[i-1][j] == '0') {if((k & (1 << m-1)) == 0) {add(dp[now][k << 1 & tt][l], dp[pre][k][l]);add(dp[now][(k << 1 | 1) & tt][l+1], dp[pre][k][l]);if((k & 1) == 0 && j > 1) add(dp[now][(k << 1 | 3) & tt][l], dp[pre][k][l]);}}else {if((k & (1 << m-1)) == 0) {add(dp[now][(k << 1 | 1) & tt][l], dp[pre][k][l]);}else {add(dp[now][k << 1 & tt][l], dp[pre][k][l]);add(dp[now][(k << 1 | 1) & tt][l+1], dp[pre][k][l]);if((k & 1) == 0 && j > 1) add(dp[now][(k << 1 | 3) & tt][l], dp[pre][k][l]);}}}}}}}int st = 0;for(int i = 1; i <= m; i++) {st <<= 1;st |= g[n][i] == '1';}int ans = 0;for(int i = C; i <= D; i++) add(ans, dp[now][st][i]);printf("%d\n", ans);}int main(){while(scanf("%d%d%d%d", &n, &m, &C, &D) != EOF) {work();}return 0;}

0 0