Compilare: main.cpp: In function 'void dfs(int)': main.cpp:29:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[nod].size() && ok==1; i++){ ~^~~~~~~~~~~~~~ main.cpp:18:7: warning: unused variable 'st' [-Wunused-variable] int st, dr, i; ^~ main.cpp:18:11: warning: unused variable 'dr' [-Wunused-variable] int st, dr, i; ^~ main.cpp: In function 'int main()': main.cpp:46:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ main.cpp:49:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a, &b); ^