Compilare: main.cpp: In function 'int main()': main.cpp:27:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(stdin, "%d %d", &n, &m) ; ^ main.cpp:29:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(stdin, "%d %d", &x, &y) ; ^