Compilare: user.cpp: In function ‘void solve()’: user.cpp:79:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < infas.size()-1; i++) { ^ user.cpp:86:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < infas.size()-1; j++) { ^ user.cpp: In function ‘int main()’: user.cpp:103:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.in", "r", stdin); ^ user.cpp:104:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.out", "w", stdout); ^