Increasing Subsequence (easy version)
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Increasing Subsequence (easy version)
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https://codeforces.com/contest/1157/problem/C1
題意:給一個不重復的元素的數(shù)組,每次可以在頭或者尾取一個數(shù),求取數(shù)最長嚴格遞增序列的方法
題解:因為元素不重復,每次選大于上一個值,而且絕對值相對較小的
/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=200000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; string ans,cnt,flag,temp,sum; int a[N]; char str; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d",&n);for(int i=1;i<=n;i++)scanf("%d",&a[i]);l=1;r=n;int now=0;while(l<=r){bool u=a[l]>now;bool v=a[r]>now;if(u&&v){if(a[l]-now<a[r]-now){ans+='L';now=a[l++];}else{ans+='R';now=a[r--];}}else if(u||v){if(u){ans+='L';now=a[l++];}else{ans+='R';now=a[r--];}}else{break;}}cout<<ans.size()<<endl;cout<<ans<<endl;//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }?
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