View Compilation Error

0_0_33017225_21728.cpp: In function 'void ST(int)':
0_0_33017225_21728.cpp:59:27: error: 'st' was not declared in this scope
     for(int i=1;i<=n;i++) st[i][0]=height[i];
                           ^
0_0_33017225_21728.cpp:62:13: error: 'st' was not declared in this scope
             st[i][j]=min(st[i][j-1],st[i+(1<<(j-1))][j-1]);
             ^
0_0_33017225_21728.cpp: In function 'int getmin(int, int)':
0_0_33017225_21728.cpp:67:16: error: 'st' was not declared in this scope
     return min(st[l][k],st[r-(1<<k)+1][k]);
                ^