Compilare: user.cpp: In function ‘void solve_comp(int)’: user.cpp:108:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < comp_content[comp].size(); ++ i) { ^ user.cpp:169:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < comp_content[comp].size(); ++ i) { ^ user.cpp: In function ‘int main()’: user.cpp:178:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.in", "r", stdin); ^ user.cpp:179:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.out", "w", stdout); ^