Compilare: main.cpp: In function 'int main()': main.cpp:36:26: warning: unused variable 'nod' [-Wunused-variable] int n, m, i, u, v, ok, nod ; ^~~ main.cpp:37:33: 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:39:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &u, &v) ; ^