Compilare: main.cpp: In function 'void dfs(int)': main.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<=graf[x].size()-1; ++i) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfsinv(int)': main.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<=invers[x].size()-1; ++i) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:77:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<=comp[i].size()-1; ++j) ~^~~~~~~~~~~~~~~~~~ main.cpp:48:31: 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:51:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x,&y); ^