View Compilation Error

0_0_33552703_9789.cpp: In function 'int cal(int, int)':
0_0_33552703_9789.cpp:12:64: error: 'min' was not declared in this scope
  if(f[i][j]<r) f[i+1][j+1]=min(f[i+1][j+1],g[f[i][j]+1][b[i+1]]);
                                                                ^