CodeForces 670B Game of Robots
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思路:水题
#include<bits\stdc++.h>using namespace std;const int maxn = 1e6;int a[maxn];int main(){int n,k;scanf("%d%d",&n,&k);for (int i = 1;i<=n;i++)scanf("%d",&a[i]);int sum = 0; for (int i = 1;i<=n;i++){ sum+=i;if (sum>=k){sum = i-(sum-k);printf("%d\n",a[sum]);break;}}}
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