Compilare: user.cpp: In function ‘int main()’: user.cpp:73:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graph[nod[i]].size(); ++j) { ~~^~~~~~~~~~~~~~~~~~~~~~ user.cpp:57:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:59:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &val[i]); ^ user.cpp:64:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a, &b); ^