http://poj.org/problem?id=2739
2.Idea
Enumerating primes
3.Source
const int maxp = 2000;
int n = 10000;
int prime[maxp], total = 0;
bool isPrime(int k)
{
for (int i = 0; i < total; i++) {
if (k % prime[i] == 0) return false;
}
return true;
}
int main()
{
for (int i = 2; i <= n; i++) {
if (isPrime(i)) prime[total++] = i;
}
prime[total] = n + 1;
int m;
cin >> m;
while (m) {
int ans = 0;
for (int i = 0; m >= prime[i]; i++) {
int cnt = 0;
for (int j = i; j < total && cnt < m; j++) {
cnt += prime[j];
}
if (cnt == m) ans++;
}
cout << ans << endl;
cin >> m;
}
return 0;
}
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