Compilare: user.cpp: In function ‘int main()’: user.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<g[3].size();i++) k++,t[k].tip=3,t[k].pos=g[3][i]; ^ user.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<g[1].size();i++) k++,t[k].tip=1,t[k].pos=g[1][i]; ^ user.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<g[2].size();i++) k++,t[k].tip=2,t[k].pos=g[2][i]; ^ user.cpp:14:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenul.in","r",stdin); ^ user.cpp:15:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenul.out","w",stdout); ^ user.cpp:16:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:18:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=m;i++) scanf("%d",&v[i]),g[v[i]].push_back(i); ^