Compilare: main.cpp: In function 'void dfs(int)': main.cpp:12:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < g[nod].size(); i++ ) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:24:34: 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:26:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &a, &b ); ^