# PROBLEM LINK:

Practice

Contest: Division 1

Contest: Division 2

Contest: Division 3

Contest: Division 4

* Authors:* d_k_7386, preet_25

*tabr*

**Tester:***iceknight1093*

**Editorialist:**# DIFFICULTY:

895

# PREREQUISITES:

None

# PROBLEM:

Given the runs scored in each of N balls, find the number of times when the strike rate was exactly 100.

# EXPLANATION:

Recall that the strike rate is defined as

\frac{ \text{total runs scored} } { \text{balls faced} } \cdot 100

This equals 100 if and only if the number of runs scored equals the number of balls faced.

After i balls, the number of runs scored is exactly A_1 + A_2 + \ldots + A_i.

So, the answer is simply the number of i such that A_1 + A_2 + \ldots + A_i = i.

This can be easily computed in \mathcal{O}(N) with a simple loop.

# TIME COMPLEXITY

\mathcal{O}(N) per test case.

# CODE:

## Editorialist's code (Python)

```
for _ in range(int(input())):
n = int(input())
a = list(map(int, input().split()))
runs, ans = 0, 0
for i in range(n):
runs += a[i]
if runs == i+1: ans += 1
print(ans)
```