P1387 最大正方形

Posted 2022-05-09 hahaha2124652975

另一道线性dp水题

 1 #include<set>
 2 #include<map>
 3 #include<list>
 4 #include<queue>
 5 #include<stack>
 6 #include<string>
 7 #include<cmath>
 8 #include<ctime>
 9 #include<vector>
10 #include<bitset>
11 #include<memory>
12 #include<utility>
13 #include<cstdio>
14 #include<sstream>
15 #include<iostream>
16 #include<cstdlib>
17 #include<cstring>
18 #include<algorithm>
19 using namespace std;
20 
21 int n,m,ans;
22 int a[105][105],f[105][105];
23 
24 int mi(int a,int b)return a<b?a:b;
25 int ma(int a,int b)return a>b?a:b;
26 
27 int main()
28     scanf("%d%d",&n,&m);
29     for(int i=1;i<=n;i++)
30         for(int j=1;j<=m;j++)
31             scanf("%d",&a[i][j]);
32         
33     
34     for(int i=1;i<=n;i++)
35         for(int j=1;j<=m;j++)
36             f[i][j]=(a[i][j]==1?mi(f[i-1][j],mi(f[i-1][j-1],f[i][j-1]))+a[i][j]:f[i][j]);
37             ans=ma(ans,f[i][j]);
38         
39     
40     printf("%d\n",ans);
41     return 0;
42