6个点RE，蒟蒻求助

#include<iostream>
#include<iomanip>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
#include<cstdlib>
using namespace std;
#define N 100005
int a[N] = {0};
int sum[N] = {0};
bool cmp(int a,int b){
    return a > b;
}
int main(){
    int n;
    cin>>n;
    memset(a,0,sizeof a);
    for(int i = 0;i < n;++i){
        cin>>a[i];
    }
    int ans = 1;
    for(int i = 0;i < n;++i){
        if(a[i] < a[i + 1]){
            ++ans;
            sum[i] = ans;
        }
        else{
            ans = 1;
            sum[i] = ans;
        }
    }
    sort(sum,sum + n,cmp);
    cout<<sum[0];
    return 0;
}