https://www.luogu.com.cn/record/38414155

#include<cstdio>
#include<cassert>
int t,n;
int main(){
    scanf("%d",&t);
    while(t--){
        scanf("%d",&n);
        for(int i=1,x;i<=n;i++)scanf("%d",&x),assert(i==x);
    }
    return 0;
}