Easy Problem from Rujia Liu?(UVa 11991) map应用
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来自《算法竞赛入门经典训练指南》
1.题目原文
https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=3142
给出一个n个整数的数组,有m个查询,每次查询两个整数k和v,输出从左到右第k个v的下标(数组的下标从1到n),不存在输出0
2.解题思路
可以利用map,每个值v映射一个下标k,即data[v]。而题目要求的是可能有多个k,因此data[v]应该是一个数组,显然数组大小未定,用不定长数组vector很容易解决。
时间复杂度为O(nlogn)
3.AC代码
#include <algorithm>#include <cctype>#include <cmath>#include <cstdio>#include <cstdlib>#include <cstring>#include <iomanip>#include <iostream>#include <map>#include <queue>#include <string>#include <set>#include <vector>#include<cmath>#include<bitset>#include<sstream>using namespace std;#define INF 0x7fffffff#define maxn 10005map<int,vector<int> >a;int main(){ int n,m,k,v; while(scanf("%d%d",&n,&m)==2){ for(int i=0;i<n;i++){ int x; scanf("%d",&x); if(!a.count(x)){ a[x]=vector<int>(); } a[x].push_back(i+1); } while(m--){ scanf("%d%d",&k,&v); if(!a.count(v)||a[v].size()<k){ printf("0\n"); } else printf("%d\n",a[v][k-1]); } } return 0;}
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