Compilare: user.cpp: In function ‘void dfs1(int, int)’: user.cpp:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(x=0;x<v[nod].size();x++) ^ user.cpp: In function ‘void dfs2(int, int)’: user.cpp:46:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ^ user.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v[nod].size();i++) maxst[i]=max(maxst[i],maxst[i-1]); ^ user.cpp:63:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ^ user.cpp:69:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<v[nod].size()-1 && maxdr[i+1]>-1) down[v[nod][i]]=max(down[v[nod][i]],maxdr[i+1]-sum[i]+1); ^ user.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:83:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sushi2.in", "r", stdin); ^ user.cpp:84:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sushi2.out", "w", stdout); ^ user.cpp:86:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:89:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:92:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int j=0;j<k;j++) scanf("%d",&v[i][j]); ^ user.cpp:96:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&t); ^