Algorithm

C. Stripe
time limit per test
2 seconds
memory limit per test
64 megabytes
problem Link- https://codeforces.com/problemset/problem/18/C
input
standard input
output
standard output

Once Bob took a paper stripe of n squares (the height of the stripe is 1 square). In each square he wrote an integer number, possibly negative. He became interested in how many ways exist to cut this stripe into two pieces so that the sum of numbers from one piece is equal to the sum of numbers from the other piece, and each piece contains positive integer amount of squares. Would you help Bob solve this problem?

Input

The first input line contains integer n (1 ≤ n ≤ 105) — amount of squares in the stripe. The second line contains n space-separated numbers — they are the numbers written in the squares of the stripe. These numbers are integer and do not exceed 10000 in absolute value.

Output

Output the amount of ways to cut the stripe into two non-empty pieces so that the sum of numbers from one piece is equal to the sum of numbers from the other piece. Don't forget that it's allowed to cut the stripe along the squares' borders only.

Examples
input
Copy
9
1 5 -6 7 9 -16 0 -2 2
output
Copy
3
input
Copy
3
1 1 1
output
Copy
0
input
Copy
2
0 0
output
Copy
1



 

Code Examples

#1 Code Example with C++ Programming

Code - C++ Programming

#include <cstdio>
#include <vector>

int main(){

    long n; scanf("%ld\n", &n);
    std::vector<long long> numbers(n,0);
    long long total(0), leftSum(0), ways(0);

    for(long k = 0; k < n; k++){scanf("%lld ", &numbers[k]); total += numbers[k];}
    for(long k = 0; k < n - 1; k++){leftSum += numbers[k]; if(2 * leftSum == total){++ways;}}

    printf("%lld\n", ways);

    return 0;
}
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Input

x
–
+
cmd
9
1 5 -6 7 9 -16 0 -2 2

Output

x
–
+
cmd
3
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Demonstration

Codeforces Solution-C. Stripe-Solution in C, C++, Java, Python

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