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帮我看一下#include <stdio.h>
int buffer[100000];
int main(void)
{
long long int n,m,sum,temp,i,t;
scanf("%I64d %I64d",&n,&m);
for(i=0;i<n;i++)
{
scanf("%d",buffer[i]);
}
sum=0;
t=buffer[0];
temp=0;
for(i=0;i<n;i++)
{
if(temp+buffer[i]<=m && buffer[i]<=t)
{
temp+=buffer[i];
}
else
{
if(buffer[i]>m) {
sum=-1;
break;
}
temp=0;
sum+=t;
t=buffer[i];
}
}
printf("%I64d",sum);
return 0;
}
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