Compilare: user.cpp: In function ‘int main()’: user.cpp:81:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < v[i].size() / 2; k++) ^ user.cpp:110:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1; j<v[i].size(); j++) ^ user.cpp:61:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ulei.in", "r", stdin); ^ user.cpp:62:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ulei.out", "w", stdout); ^ user.cpp:64:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^ user.cpp:68:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:71:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &x[i], &y[i], &c[i]); ^