Compilare: user.cpp: In function ‘int main()’: user.cpp:29:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=0;k<g[j].size();++k) ^ user.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[0].size();++i) ^ user.cpp: In function ‘void citire()’: user.cpp:8:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:13:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^ user.cpp: In function ‘int main()’: user.cpp:21:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.in","r",stdin); ^ user.cpp:22:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.out","w",stdout); ^