Compilare: user.cpp: In function ‘int main()’: user.cpp:57:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptr < ev.size() && get<0>(ev[ptr]) == i && get<1>(ev[ptr]) == 0) { ^ user.cpp:64:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptr < ev.size() && get<0>(ev[ptr]) == i && get<1>(ev[ptr]) == 1) { ^ user.cpp:36:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hapsan.in", "r", stdin); ^ user.cpp:37:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hapsan.out", "w", stdout); ^ user.cpp:39:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &n); ^ user.cpp:41:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &s[i]); ^ user.cpp:46:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &m); ^ user.cpp:48:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &a[i], &b[i]); ^