Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();++i){ ^ user.cpp: In function ‘void dfx(int)’: user.cpp:52:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idf=0;idf<v[x].size();++idf){ ^ user.cpp:67:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();++i){ ^ user.cpp:71:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idf=0;idf<v[x].size();++idf){ ^ user.cpp: In function ‘int main()’: user.cpp:111:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i){ ^ user.cpp:132:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<intervals[i].size();++j){ ^ user.cpp:99:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:102:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&tx,&nm); ^ user.cpp:148:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&M); ^