#include <cstdio> #include <iostream> #include <cstring> #include <vector> using namespace std; char map[110][110]; int n,m; #define inf 100000 struct node { int x,y; }; vector <node> nn; int main() { while(1) { int i,j,k; scanf("%d%d",&n,&m); if(n==0) break; getchar(); for(i=1;i<=n;i++) { for(j=1;j<=m;j++) scanf("%c",&map[i][j]); getchar(); } for(k=0;k<26;k++) { nn.clear(); int maxx=0,maxy=0,minx=inf,miny=inf; char x=‘A‘+k; int flag=1; for(i=1;i<=n;i++) for(j=1;j<=m;j++) if(map[i][j]==x) { node tmp; tmp.x=i; tmp.y=j; nn.push_back(tmp); } for(i=0;i<nn.size();i++) { if(nn[i].x>maxx) maxx=nn[i].x; if(nn[i].x<minx) minx=nn[i].x; if(nn[i].y>maxy) maxy=nn[i].y; if(nn[i].y<miny) miny=nn[i].y; } if(maxx<minx+2) continue;//printf("aaa"); if(maxy<miny+2) continue; if(nn.size()!=(maxx-minx+maxy-miny)*2) flag=0; for(i=minx+1;i<maxx;i++) for(j=miny+1;j<maxy;j++) if(isupper(map[i][j])) { flag=0; break; } if(flag) printf("%c",x); } printf("\n"); } return 0; }
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原文地址:http://www.cnblogs.com/vermouth/p/3839939.html