Compilare: user.cpp: In function ‘void solve()’: user.cpp:42:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < elem.size(); ++i) ^ user.cpp:48:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v2.size(); ++i) ^ user.cpp:52:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v1.size(); ++i) ^ user.cpp: In function ‘void readData()’: user.cpp:23:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:25:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf\n", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:58:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.in", "r", stdin); ^ user.cpp:59:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.out", "w", stdout); ^