Main.cc: In function ‘int main()’: Main.cc:19:13: warning: unused variable ‘s’ [-Wunused-variable] int s=0; ^ Main.cc:22:22: error: ‘y’ was not declared in this scope for(int b=j;b>=y;b--){ ^ Main.cc:23:8: error: ‘s’ was not declared in this scope s+=a1[a][b]; ^ Main.cc:26:9: error: ‘s’ was not declared in this scope if(s==0){ ^ Main.cc:27:22: error: ‘y’ was not declared in this scope tmp=(i-x+1)*(j-y+1); ^ Main.cc: At global scope: Main.cc:34:2: error: ‘cout’ does not name a type; did you mean ‘cosl’? cout<