/in/foo.cc: In function 'int main()':
/in/foo.cc:9:51: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 M[i][j]=u;P[c]=make_pair(u,c);x[c]=i,y[c]=j;c++;}}for(int i=1;i<c;i++)
                                                   ^~~
/in/foo.cc:10:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
 pa[i]=i;T=read();t=T;for(int i=1;i<=T;i++)a[i]=read();sort(P,P+c),c--;
         ^