Compilare: user.cpp: In function ‘int main()’: user.cpp:23:39: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(w[i].f == a || w[i].f <= a && w[i].s > a) ^ user.cpp:15:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(F, "%d %d %d ", &a, &b, &n); ^ user.cpp:17:61: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(F, "%d %d ", &p[i].f, &p[i].s), fr[p[i].f] ++; ^