HDU 2577 How to Type （dp）

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题目链接：轻点我一下 >3<

蛮有意思的一道题开两个数组一个开灯on 一个关灯的off 然后分别对大小写字母进行决策就好了

需要注意的是最后不要忘记关灯

AC代码如下：

////  HDU 2577 How to Type////  Created by TaoSama on 2015-02-08//  Copyright (c) 2014 TaoSama. All rights reserved.//#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>#define CLR(x,y) memset(x, y, sizeof(x))using namespace std;const int INF = 0x3f3f3f3f;const int MOD = 1e9 + 7;const int N = 1e5 + 10;int t, on[105], off[105];int main() {#ifdef LOCALfreopen("in.txt", "r", stdin);//freopen("out.txt","w",stdout);#endifios_base::sync_with_stdio(0);while(cin>>t){while(t--){char s[105]; cin>>(s+1);int l = strlen(s+1);CLR(on,0x3f); CLR(off,0x3f);on[0] = 1; off[0] = 0;for(int i=1;i<=l;++i){if(islower(s[i])){on[i] = min(on[i-1]+2,off[i-1]+2); //按shift打, 打完开灯off[i] = min(on[i-1]+2,off[i-1]+1); //关灯打, 直接打}else{on[i] = min(on[i-1]+1,off[i-1]+2); //直接打, 按shift打off[i] = min(on[i-1]+2,off[i-1]+2); //打完关灯, 按shift打}}++on[l]; //最后必须关灯cout<<min(on[l],off[l])<<endl;}}return 0;}

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