Compilare: user.cpp: In function ‘bool cuplaj(const int&)’: user.cpp:53:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp:64:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:97:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < L[a].size(); j ++) ^ user.cpp:104:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j < L[a].size()) ^ user.cpp:80:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("java.in", "r", stdin); ^