把上界改成 i <= n 的后果

#include <iostream>
using namespace std;

bool isPrime(int n) {
  if (n <= 1) {
    return false;
  }
  for (int i = 2; i * i <= n; i++) {
    if (n % i == 0) {
      return false;
    }
  }
  return true;
}

int countPrimes(int n) {
  int count = 0;
  for (int i = 2; i <= n; i++) {
    if (isPrime(i)) {
      count++;
    }
  }
  return count;
}

int sumPrimes(int n) {
  int sum = 0;
  for (int i = 2; i <= n; i++) {
    if (isPrime(i)) {
      sum += i;
    }
  }
  return sum;
}

int main() {
  int x;
  cin >> x;
  cout << countPrimes(x) << " " << sumPrimes(x) << endl;
  return 0;
}