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贴个代码供大家参考#include <stdio.h>
int main()
{
long n;
scanf("%ld",&n);
long a,b,c,k;
long i;
scanf("%ld",&a);
for(i=1;i<n;i++)
{
if(i==1){
b = a;
c = 0;}
scanf("%ld",&a);
k = c + a > b ? c + a: b;
c = b - a > c ? b - a: c;
b = k;
}
if(b > c) printf("%ld\n",b);
else
printf("%ld\n",c);
return 0;
}
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