Compilare: user.cpp: In function ‘int main()’: user.cpp:69:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<dist[val1].size();++j) ^ user.cpp:79:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[val1].size();++i) ^ user.cpp:89:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<dist[v].size();++j) ^ user.cpp:115:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<dist[v].size();++j) ^ user.cpp:140:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<dist[n].size();++i) ^ user.cpp:34:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ubuntzei.in","r",stdin); ^ user.cpp:35:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ubuntzei.out","w",stdout); ^ user.cpp:37:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ user.cpp:40:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&city[i]); ^ user.cpp:45:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z); ^ user.cpp:68:13: warning: ‘pozz’ may be used uninitialized in this function [-Wmaybe-uninitialized] int pozz; ^