Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:24:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=j; i<mu[x].size()-1; i++) ^ user.cpp:46:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=mu[x].size(); i++) ^ user.cpp:50:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=mu[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:76:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,x,y; ^ user.cpp:74:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("autostrazi.in","r",stdin); ^ user.cpp:75:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("autostrazi.out","w",stdout); ^ user.cpp:78:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&s,&k); ^ user.cpp:80:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&pret[i]); ^ user.cpp:83:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp: In function ‘void dfs(int)’: user.cpp:24:19: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=j; i<mu[x].size()-1; i++) ^