Codeforces #228 D2E / D1C：Fox and Card Game

题目：http://codeforces.com/contest/389/problem/E

参考：http://codeforces.com/blog/entry/10605

刚开始做的时候直接用贪心法，每次都选最大的卡片，结果WA。

代码：

// Fox and Card Game

#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <iostream>
#include <sstream>
#include <iomanip>

#include <bitset>
#include <string>
#include <vector>
#include <stack>
#include <deque>
#include <queue>
#include <set>
#include <map>

#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <cstring>
#include <ctime>
#include <climits>

using namespace std;
typedef pair<int, int> pii;
typedef long long llong;
typedef pair<llong, llong> pll;
#define mkp make_pair

int main()
{

//#define LOCAL // 提交时注释掉 /*******************************************/

#ifdef LOCAL
freopen("data.txt", "r", stdin);
#endif

int n;
vector <int> middle;
while (cin >> n) {
middle.clear();
int cnt1, cnt2;
cnt1 = cnt2 = 0;
for (int i = 0; i < n; i++) {
int s;
cin >> s;
int t = s / 2;
int c;
for (int j = 0; j < t; j++) {
scanf("%d", &c);
cnt1 += c;
}
if (s & 1) { // odd
scanf("%d", &c);
middle.push_back(c);
}
for (int j = 0; j < t; j++) {
scanf("%d", &c);
cnt2 += c;
}
}
sort(middle.begin(), middle.end(), greater <int>() );
for (int i = 0; i < middle.size(); i += 2) {
cnt1 += middle[i];
if (i + 1 < middle.size()) {
cnt2 += middle[i + 1];
}
}
cout << cnt1 << " " << cnt2 << endl;
}

return 0;
}