Compilare: main.cpp: In function 'int main()': main.cpp:48:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (j=1;j<=m;++j) ^~~ main.cpp:51:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' area1=area2=area3=n*m+1; ^~~~~ main.cpp: In function 'void solve(int)': main.cpp:26:39: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] if (sum>smax || (sum==smax && (j-i+1)*(k-p+1)<val)) x1=i,x2=j,y1=p,y2=k,smax=sum,val=(j-i+1)*(k-p+1); ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~