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:54:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<pos[pas].size();i++){ ~^~~~~~~~~~~~~~~~ main.cpp:59:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[pas].size();j++){ ~^~~~~~~~~~~~~~ main.cpp:64:27: 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:99:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[i].size();j++){ ~^~~~~~~~~~~~ main.cpp:115:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[vecin].size();j++) ~^~~~~~~~~~~~~~~~ main.cpp:76:30: 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:78:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&x); ^ main.cpp:80:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&y); ^ main.cpp:84:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&y); ^ main.cpp:107:28: warning: 'vecin' may be used uninitialized in this function [-Wmaybe-uninitialized] pus[vecin] = 1; ~~~~~~~~~~~^~~