67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
#include<cstdio>
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#include<cmath>
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#include<iostream>
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#include<queue>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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typedef long long ll;
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const ll maxn=100005;
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ll T,n,m,a[maxn],sum,tot;
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bool flag;
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int f[maxn][2];
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int main()
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{
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scanf("%lld",&T);
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while (T--)
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{
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scanf("%lld",&n);
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sum=0; flag=true;
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for (int i=0;i<n;i++)
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{
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scanf("%lld",&a[i]);
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sum+=a[i];
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}
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if (sum%n) flag=false;
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else
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{
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sum=sum/n;
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tot=0;
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for (int i=0;i<n;i++) a[i]-=sum;
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memset(f,0,sizeof(f));
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for (int i=0,j,k;i<n+n;i++)
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{
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j=i%n; k=(i+1)%n;
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if (a[j]>0&&a[k]<=0&&!f[j][1]) {
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a[k]++;
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a[j]--;
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if (!f[k][0]) f[j][1]=1;
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else f[k][0]=f[j][1]=0;
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}
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else if (a[j]<0&&a[k]>=0&&!f[k][0]) {
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a[k]--;
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a[j]++;
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if (!f[j][1]) f[k][0]=1;
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else f[j][1]=f[k][0]=0;
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}
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}
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for (int i=0;i<n;i++) if (a[i]) {flag=false; break;}
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for (int i=0;i<n;i++) tot+=f[i][0]+f[i][1];
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if (n==2&&tot==2) flag=false;
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}
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if (flag)
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{
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printf("YES\n%d\n",tot);
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for (int i=1,j,k;i<=n;i++)
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{
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j=i-1; if (j==0) j=n;
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k=i+1; if (k>n) k=1;
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if (f[i-1][0]) printf("%d %d\n",i,j);
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if (f[i-1][1]) printf("%d %d\n",i,k);
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}
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}
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else printf("NO\n");
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}
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return 0;
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}
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