为什么会WA?;

#include<bits/stdc++.h>
using namespace std;
int main() {
	long long a, c [100001], x, b;
	cin >> a;
	c[1]=0; 
	for (long long i = 1; i <= a; i ++) {
		int t = 0;
		cin >> b;
		t = b;
		while (t) {
			c [i] += t % 10;
			t /= 10;
		}
	}
	x = c [1];
	for (long long i = 1; i <= a; i ++) {
		if (x < c [i + 1])
			x = c [i + 1];

	}
	cout << x;
	return 0;
}