| input | output |
|---|---|
1000000000 2 800000000 800000000 |
600000000 |
1000000000 2 500000000 500000000 |
0 |
题意:有n个人,有m种语言,然后m个输入代表每种语言有几个人会讲,要求会讲所有语言的人有几个
思路:对于两种语言的话,我们不难发现必然是a1+a2-n,那么我们以此类推,先求出会讲两种语言的人数,在把会讲两种语言的人看做一种,循环计算下去求得会讲所有语言的人有几个
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <vector>
#include <math.h>
#include <algorithm>
using namespace std;
#define ls 2*i
#define rs 2*i+1
#define up(i,x,y) for(i=x;i<=y;i++)
#define down(i,x,y) for(i=x;i>=y;i--)
#define mem(a,x) memset(a,x,sizeof(a))
#define w(a) while(a)
#define LL long long
const double pi = acos(-1.0);
#define Len 200005
#define mod 19999997
const int INF = 0x3f3f3f3f;
LL n,m,N,M;
int main()
{
w(~scanf("%I64d%I64d",&n,&m))
{
LL t = n,x;
w(m--)
{
scanf("%I64d",&x);
t = max(0LL,t+x-n);
}
printf("%I64d\n",t);
}
return 0;
}
原文:http://blog.csdn.net/libin56842/article/details/45133693