Compilare: user.cpp: In function ‘int main()’: user.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[i] * v[i + 1] > d1&&i!=x3) { ^ user.cpp:27:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[i] * v[i + 1] > d2) && (i!=x1-1)&&i!=x1&&i!=x1+1) { ^ user.cpp:27:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[i] * v[i + 1] > d2) && (i!=x1-1)&&i!=x1&&i!=x1+1) { ^ user.cpp:27:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[i] * v[i + 1] > d2) && (i!=x1-1)&&i!=x1&&i!=x1+1) { ^ user.cpp:21:33: warning: ‘x3’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (v[i] * v[i + 1] > d1&&i!=x3) { ^ user.cpp:38:58: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((long long)d1+d2>d3) s=s-(v[x1] + v[x1 + 1]+v[x2]+v[x2+1])+d2+d1; ^ user.cpp:38:34: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((long long)d1+d2>d3) s=s-(v[x1] + v[x1 + 1]+v[x2]+v[x2+1])+d2+d1; ^