#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define rd_signed() ({int _s=*rp=='-'&&++rp,_v=rd();_s?-_v:_v;})
#define WTHI(v) {unsigned _z=v,_n=0;long _d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define WTLO(v) {unsigned _z=v,_n=8;long _d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;}
#define wt(v) ({ulong _v=v;if(_v>=100000000){WTHI(_v/100000000);WTLO(_v%100000000);}else{WTHI(_v);}})
#define rep(v,e) for(typeof(e)v=0;v<e;++v)
//#define reps(v,s,e) for(typeof(e)v=s;v<e;++v)
#define rrep(v,e) for(typeof(e)v=e;v--;)
#define repeat(e) for(typeof(e)_=e;_--;)
#define min(a,b) (a<=b?a:b)
#define max(a,b) (a>=b?a:b)
#define chmax(v,a) (v=v>=a?v:a)

typedef unsigned long ulong;

char wbuf[1<<25];
int a[200000];

int main(){
	char*wp=wbuf;
	rd_init();
	int t=rd();
	repeat(t){
		int n=rd();
		long s=0;
		rep(i,n){
			s+=a[i]=rd_signed()*2;
		}
		long b=0,c=0;
		long z=0,t=s>>1;
		s=0;
		rep(i,n){
			s+=a[i];
			chmax(b,s);
			chmax(c,-s);
			chmax(z,b-s+t);
			chmax(z,c+s-t);
		}
		wt(z);
		*wp++='\n';
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}