#include <stdio.h>
#include <stdlib.h>

#define DEBUG 1
#define NO 0
#define YES 1

int main ( int argc ,char *argv[] ) {

    int t;
    scanf("%d" , &t);

    while ( t-- ) {
        int n , i , answer = YES;

        scanf("%d" , &n);

        if ( n == 1 ) {
            int x;
            scanf("%d" , &x);
            if ( x == 0 )
                printf("YES\n");
            else
                printf("NO\n");

            continue;
        }

        int count = 0;
        scanf("%d" , &count);
        for ( i = 1 ; i < n ; i++ ) {

            int x;
            scanf("%d" , &x);

            x = x - count;
            if ( x < 0 )
                answer = NO;
            count = x;
        }

        if ( count == 0 && answer == YES )
            printf("YES\n");
        else
            printf("NO\n");

    }

    return 0;
}