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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4. ios_base::sync_with_stdio(false);
  5. cin.tie(NULL);
  6. int a,b,x,y;
  7. int contador = 0;
  8. cin >> a >> b >> x >> y;
  9. int camino_largo = max(x,y);
  10. int camino_corto = min(x,y);
  11. for(a; a <= b;a++){
  12. if((camino_largo < a) and (camino_corto < a)){
  13. contador++;
  14. }
  15. }
  16. int cont = 0;
  17. for(int i=0; i <= contador; i++){
  18. cont = cont + i;
  19. }
  20. cout << cont << "\n";
  21. }
Success #stdin #stdout 0s 5324KB
stdin
3 10 8 2
stdout
3