Compilare: main.cpp: In function 'int ok(int, int)': main.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:31:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (freq[i] == v[nod].size()) ~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void back(int)': main.cpp:50:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<pos[pas].size();i++){ ~^~~~~~~~~~~~~~~~ main.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[pas].size();j++){ ~^~~~~~~~~~~~~~ main.cpp:60:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[pas].size();j++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:71:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^ main.cpp:73:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&x); ^ main.cpp:75:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&y); ^ main.cpp:79:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&y); ^