func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 100010;   const int INF = 0x7fffffff;   long long a[MAXN];   long long sum = 0;   long long s1[MAXN];   set<long long> s;   int main() {     int n;     scanf( %d , &n);     s1[0] = 0;     for (int i = 1; i <= n; i++) {       scanf( %lld , a + i);       sum += a[i];       s1[i] = s1[i - 1] + a[i];     }     int ok = 0;     s.clear();     for (int i = 1; i <= n; i++) {       if (s.count(2 * a[i])) {         ok = 1;         break;       }       long long x = sum - 2 * s1[i];       if (x == 0) {         ok = 1;         break;       }       if (x >= 0) s.insert(x);     }     s.clear();     for (int i = n; i >= 1; i--) {       if (s.count(2 * a[i])) {         ok = 1;         break;       }       long long x = 2 * s1[i] - sum;       if (x == 0) {         ok = 1;         break;       }       if (x >= 0) s.insert(x);     }     if (ok)       puts( YES );     else       puts( NO );   }   