Compilare: main.cpp: In function 'int main()': main.cpp:37:13: warning: unused variable 'j' [-Wunused-variable] int n, i, j, k, a, b, root ; ^ main.cpp:38:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &k ) ; ^ main.cpp:40:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &a, &b ) ; ^