Compilare: user.cpp: In function ‘int main()’: user.cpp:19:24: warning: unused variable ‘ok’ [-Wunused-variable] int n, m, i, t, s, ok; ^ user.cpp:20:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &m, &t); ^ user.cpp:22:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &x[i], &y[i], &tip[i]); ^