Codeforces Round #513 by Barcelona Bootcamp (rated, Div. 1 + Div. 2), problem: (D) Social Circles

传送门:http://codeforces.com/contest/1060/problem/D

        感觉比c题好想多了,因为环可以有随便多个,自己和自己也可以成环,那就 记录l,和 r 然后两个数组sort一下,按下标配对就好了,配对取大的那个,所有对求和,然后加上n个人就是答案,代码如下。

      

#include 
using namespace std;
typedef long long LL;
inline int read(){
    int f = 1, x = 0;char ch = getchar();
    while (ch > '9' || ch < '0'){if (ch == '-')f = -f;ch = getchar();}
    while (ch >= '0' && ch <= '9'){x = x * 10 + ch - '0';ch = getchar();}
    return x * f;
}
const int maxn = 1e5 + 10;
int l[maxn],r[maxn];
int main(){
    int n = read();
    for (int i = 0; i < n; ++i) {
        l[i] = read();
        r[i] = read();
    }
    sort(l,l+n);
    sort(r,r+n);
    LL ans = 0;
    for (int i = 0; i < n; ++i) {
        ans += max(l[i],r[i]);
    }
    cout << ans + n << endl;
    return 0;
}

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