#include<iostream>
using namespace std;
int main()
{
int n=0 , m=0 , c=0 ;
int a[2][1000] , i=0;
int record;
int j=0;

while(cin>>n>>m>>c)
{
j++;

if(n==0 && m==0 && c==0)
{
return 0;
}

long long int sum=0;
long long int max=0;

for(i=1;i<=n;i++)
{
cin>>a[0][i];
a[1][i]=0;
}

for(i=0;i<m;i++)
{
cin>>record;
if(a[1][record]==0)
{
sum+=a[0][record];
a[1][record]=1;
}
else
{
sum-=a[0][record];
a[1][record]=0;
}

if(sum>c)
{
max=-1;
break;
}

if(sum>=max)
{
max=sum;
}
}

/*if(j==24)
{
max=121;
}*/
cout<<"Sequence "<<j<<endl;
if(max!=-1)
{
cout<<"Fuse was not blown."<<endl<<"Maximal power consumption was "<<max<<" amperes."<<endl<<endl;
}
else
{
cout<<"Fuse was blown."<<endl<<endl;
}
}

//system("pause");
return 0;
}

程式碼如上 

line24 電流最大值是121 

但是我的答案總是0(甚至加了註解那行也是0)

請高手指點迷津