Compilare: user.cpp: In function ‘std::vector<std::pair<long long int, long long int> > merge(std::vector<std::pair<long long int, long long int> >, std::vector<std::pair<long long int, long long int> >)’: user.cpp:35:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < B.size(); ++i) ^ user.cpp:46:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < A.size(); ++i) ^ user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == A.size() - 1 || ccw(P1, A[i], P2) > 0) { ^ user.cpp: In function ‘int main()’: user.cpp:163:39: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long long int*’ [-Wformat=] scanf("%d%d", &x[i].x, &x[i].y); ^ user.cpp:163:39: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long long int*’ [-Wformat=] user.cpp:170:49: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long long int*’ [-Wformat=] scanf("%d%d%d%d", &A.x, &A.y, &B.x, &B.y); ^ user.cpp:170:49: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long long int*’ [-Wformat=] user.cpp:170:49: warning: format ‘%d’ expects argument of type ‘int*’, but argument 4 has type ‘long long int*’ [-Wformat=] user.cpp:170:49: warning: format ‘%d’ expects argument of type ‘int*’, but argument 5 has type ‘long long int*’ [-Wformat=] user.cpp: In function ‘bool solve(std::pair<long long int, long long int>, std::pair<long long int, long long int>, int)’: user.cpp:152:27: warning: ‘hi’ may be used uninitialized in this function [-Wmaybe-uninitialized] query(1, 1, n, lo, hi); ^ user.cpp:152:27: warning: ‘lo’ may be used uninitialized in this function [-Wmaybe-uninitialized]