UVA 11991 Easy Problem from Rujia Liu?
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题意:给出一个包含n个数的数组,每次询问两个整数k和v,输出从左到右第k个v的下标。
思路:利用STL中的vector和map构造一个数组,用来储存每个v的下标。
代码:
#include <iostream>#include<cstdio>#include<cstring>#include<string>#include<algorithm>#include<map>#include<queue>#include<stack>#include<cmath>#include<vector>#define inf 0x3f3f3f3f#define Inf 0x3FFFFFFFFFFFFFFFLL#define eps 1e-9#define pi acos(-1.0)using namespace std;const int maxn=100000+10;vector<int>g[maxn];int main(){ //freopen("in.txt","r",stdin); //freopen("out.txt","w",stdout); int n,m; while(cin>>n>>m) { map<int,int>mp; for(int i=0;i<=n;++i) g[i].clear(); int tp,s=1; for(int i=1;i<=n;++i) { cin>>tp; if(mp[tp]==0) { mp[tp]=s; g[s].push_back(i); s++; } else { g[mp[tp]].push_back(i); } } int k,v; for(int i=0;i<m;++i) { cin>>k>>v; int u=mp[v]; int sz=g[u].size(); if(mp[v]==0||sz<k) { cout<<0<<endl; continue; } cout<<g[u][k-1]<<endl; } } return 0;}
- UVA - 11991 Easy Problem from Rujia Liu?
- uva - 11991 - Easy Problem from Rujia Liu?
- uva 11991 Easy Problem from Rujia Liu?
- uva 11991 - Easy Problem from Rujia Liu?
- Uva-11991-Easy Problem from Rujia Liu?
- Uva 11991 - Easy Problem from Rujia Liu?
- UVA 11991 Easy Problem from Rujia Liu?
- UVA 11991 Easy Problem from Rujia Liu?
- uva 11991 Easy Problem from Rujia Liu?
- UVA 11991 Easy Problem from Rujia Liu?
- UVA 11991 Easy Problem from Rujia Liu?
- uva 11991 - Easy Problem from Rujia Liu?
- UVa:11991 Easy Problem from Rujia Liu?
- UVA - 11991 Easy Problem from Rujia Liu?
- UVA 11991 Easy Problem from Rujia Liu?
- UVa 11991 - Easy Problem from Rujia Liu?
- UVA 11991 Easy Problem from Rujia Liu?
- UVa 11991 Easy Problem from Rujia Liu?
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