Compilare: user.cpp: In function ‘int main()’: user.cpp:54:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ama.size() == N) { ^ user.cpp:32:15: warning: unused variable ‘n1’ [-Wunused-variable] int N, M, n1, n2, cost; ^ user.cpp:32:19: warning: unused variable ‘n2’ [-Wunused-variable] int N, M, n1, n2, cost; ^ user.cpp:32:23: warning: unused variable ‘cost’ [-Wunused-variable] int N, M, n1, n2, cost; ^ user.cpp:30:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("apm.in", "r", stdin); ^ user.cpp:31:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("apm.out", "w", stdout); ^