Compilare: main.cpp: In function 'void DFS1(int)': main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < muchii1[nod].size() ; i ++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void DFS2(int)': main.cpp:28:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < muchii2[nod].size() ; i ++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:39: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::vector<int> >::size_type {aka long unsigned int}' [-Wformat=] fprintf(fout , "%d\n" , ans.size()); ^ main.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < ans.size() ; i ++) ~~^~~~~~~~~~~~ main.cpp:57:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < ans[i].size() ; j ++) ~~^~~~~~~~~~~~~~~ main.cpp:36:35: 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:40:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin , "%d%d" , &x , &y); ^