Compilare: user.cpp: In function ‘int main()’: user.cpp:38:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[i].size(); j ++) { ^ user.cpp:15:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &n, &m); ^ user.cpp:17:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &x, &y); ^ user.cpp:35:24: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] pus[poz] = true; ^