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题意：给定 n 个数，然后有 m 个询问，每个询问一个数，问你小于等于这个数的数有多少个。
析：其实很简单么，先排序，然后十分查找，so easy。
代码如下：
#pragma comment(linker, "/STACK:1024000000,1024000000")
#include <cstdio>
#include <string>
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <cstring>
#include <set>
#include <queue>
#include <algorithm>
#include <vector>
#include <map>
#include <cctype>
#include <stack>
using namespace std;
typedef long long LL;
typedef pair<int, int> P;
const int INF = 0x3f3f3f3f;
const double inf = 0x3f3f3f3f3f3f;
const LL LNF = 100000000000000000;
const double PI = acos(-1.0);
const double eps = 1e-8;
const int maxn = 1e5 + 5;
const int mod = 1e9 + 7;
const char *mark = "+-*";
const int dr[] = {-1, 0, 1, 0};
const int dc[] = {0, 1, 0, -1};
int n, m;
inline bool is_in(int r, int c){
return r >= 0 && r < n && c >= 0 && c < m;
}
inline LL Max(LL a, LL b){ return a < b ? b : a; }
inline LL Min(LL a, LL b){ return a > b ? b : a; }
int a[maxn];
int main(){
while(scanf("%d", &n) == 1){
for(int i = 0; i < n; ++i) scanf("%d", &a[i]);
sort(a, a+n);
scanf("%d", &m);
while(m--){
int x;
scanf("%d", &x);
printf("%d\n", upper_bound(a, a+n, x) - a);
}
}
return 0;
}
CodeForces 706B Interesting drink (二分查找)
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原文地址：http://www.cnblogs.com/dwtfukgv/p/5766875.html
