题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1505
思路:完全就是hdu 1506的加强版,只要取定第i行,这样就可以用1506的方法来做了,最后加个for循环就行了;
View Code
1 #include<iostream> 2 #include<algorithm> 3 const int N=1100; 4 using namespace std; 5 int l[N][N],r[N][N],h[N][N]; 6 char map[N][N]; 7 8 int main(){ 9 int _case; 10 scanf("%d",&_case); 11 while(_case--){ 12 int n,m; 13 scanf("%d%d",&n,&m); 14 for(int i=1;i<=m;i++){ 15 h[0][i]=0; 16 } 17 for(int i=1;i<=n;i++){ 18 for(int j=1;j<=m;j++){ 19 scanf("%s",&map[i][j]); 20 l[i][j]=j,r[i][j]=j; 21 if(map[i][j]=='F'){ 22 h[i][j]=h[i-1][j]+1; 23 }else if(map[i][j]=='R'){ 24 h[i][j]=0; 25 } 26 } 27 } 28 int ans=0,Max=0; 29 for(int i=1;i<=n;i++){ 30 h[i][0]=h[i][m+1]=-1; 31 for(int j=1;j<=m;j++){ 32 while(h[i][l[i][j]-1]>=h[i][j]) 33 l[i][j]=l[i][l[i][j]-1]; 34 } 35 for(int j=m;j>=1;j--){ 36 while(h[i][r[i][j]+1]>=h[i][j]) 37 r[i][j]=r[i][r[i][j]+1]; 38 } 39 for(int j=1;j<=m;j++){ 40 ans=(r[i][j]-l[i][j]+1)*h[i][j]; 41 Max=max(ans,Max); 42 } 43 } 44 printf("%d\n",3*Max); 45 } 46 return 0; 47 }