Compilare: user.cpp: In function ‘int main()’: user.cpp:20:38: warning: array subscript is below array bounds [-Warray-bounds] sum[i][j]=a[i][j]+sum[i-1][j]+sum[i][j-1]-sum[i-1][j-1]; ^ user.cpp:20:62: warning: array subscript is below array bounds [-Warray-bounds] sum[i][j]=a[i][j]+sum[i-1][j]+sum[i][j-1]-sum[i-1][j-1]; ^ user.cpp:25:65: warning: array subscript is below array bounds [-Warray-bounds] sc=sum[i][j]-sum[l-1][j]-sum[i][c-1]+sum[l-1][c-1]; ^