Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[x].size(); ++i) ^ user.cpp:26:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<gr[y].size() and v[gr[x][i]]>v[gr[y][j]]) ^ user.cpp:28:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=j; k<gr[y].size() and v[gr[x][i]]==v[gr[y][k]]; ++k) ^ user.cpp:36:51: warning: operation on ‘nouy’ may be undefined [-Wsequence-point] noux=noux+nouy-(nouy=noux); ^ user.cpp: In function ‘int main()’: user.cpp:83:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<gr[i].size(); ++j) ^ user.cpp:88:47: warning: operation on ‘nouy’ may be undefined [-Wsequence-point] noux=noux+nouy-(nouy=noux); ^ user.cpp: In function ‘void generare()’: user.cpp:51:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.in", "w", stdout); ^ user.cpp: In function ‘int main()’: user.cpp:60:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.in", "r", stdin); ^ user.cpp:61:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.out", "w", stdout); ^ user.cpp:64:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:68:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &x, &y); ^ user.cpp:75:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c ", &v[i]); ^