题目传送门

 /*
题意:有一堆砖块,每一次操作可以选择消去任意一行,也可以选择消去任意一列。求要消去所有的砖块需要最小的操作数
贪心:首先清楚的是消去最高列的最佳,消去第一行最佳,行列的顺序只对中间过程影响,和结果无关
首先sort降序,选择消去列的个数,更新最小值
当时想复杂了,貌似是上学期校赛留下的阴影:)
详细解释:http://blog.csdn.net/liao_jingyi/article/details/40455311
*/
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>
#include <cmath>
#include <set>
#include <map>
#include <queue>
using namespace std; const int MAXN = 1e6 + ;
const int INF = 0x3f3f3f3f;
int a[MAXN]; bool cmp(int x, int y)
{
return x > y;
} int main(void) //Gym 100502E Opening Ceremony
{
//freopen ("E.in", "r", stdin); int n;
while (scanf ("%d", &n) == )
{
for (int i=; i<=n; ++i)
{
scanf ("%d", &a[i]);
} sort (a+, a++n, cmp); int ans = n;
for (int i=; i<=n; ++i)
{
ans = min (ans, i - + a[i]);
} printf ("%d\n", ans);
} return ;
}

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