Compilare: main.cpp: In function 'int main()': main.cpp:39:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < muchii[curent].size() ; i ++) ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:20:35: 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:24:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin , "%d%d" , &x , &y); ^