Compilare: user.cpp: In function ‘int main()’: user.cpp:52:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j <cablu1[i].size(); j++) ^ user.cpp:56:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j <cablu2[i].size(); j++) ^ user.cpp:78:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i< points.size(); i++) ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi3.out","w",stdout); ^