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一次AC~~贴个二分代码~~高手指教#include<cstdio> #include<algorithm> using namespace std; unsigned group[40000], sum[40000];//题目中给的最大数据一定不会超过40000组(粗略) int main() { int t, i, j, k, n, ans; char s[10]; scanf("%d", &t); group[0] = 0, sum[0] = 0; for( j=1; j<40000; j++) { group[j] += group[j-1] + 1 + (j/10 > 0) + (j/100 > 0) + (j/1000 > 0) + (j/10000 > 0);//递推计算第j组里有几个数字 sum[j] = sum[j-1] + group[j];//计算前j组数字个数之和 } while( t-- ) { scanf("%d", &i); k = lower_bound(sum, sum+40000, i) - sum;//计算第i个数位于哪个组 n = i - sum[k-1];//计算该数位于该组中的第几个位置 k = lower_bound(group, group+40000, n) - group;//找到位于哪个数中 n -= group[k-1];//该数的第几个位置 sprintf(s, "%d", k);//转化为字符形式,方便查找 ans = s[n-1] - '0'; printf("%d\n", ans); } return 0; } Followed by: Post your reply here: |
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