时间限制:1000ms
单点时限:1000ms
内存限制:256MB
描述
80 Days is an interesting game based on Jules Verne’s science fiction “Around the World in Eighty Days”. In this game, you have to manage the limited money and time.
Now we simplified the game as below:
There are n cities on a circle around the world which are numbered from 1 to n by their order on the circle. When you reach the city i at the first time, you will get ai dollars (ai can even be negative), and if you want to go to the next city on the circle, you should pay bi dollars. At the beginning you have c dollars.
The goal of this game is to choose a city as start point, then go along the circle and visit all the city once, and finally return to the start point. During the trip, the money you have must be no less than zero.
Here comes a question: to complete the trip, which city will you choose to be the start city?
If there are multiple answers, please output the one with the smallest number.
输入
The first line of the input is an integer T (T ≤ 100), the number of test cases.
For each test case, the first line contains two integers n and c (1 ≤ n ≤ 106, 0 ≤ c ≤ 109). The second line contains n integers a1, …, an (-109 ≤ ai ≤ 109), and the third line contains n integers b1, …, bn (0 ≤ bi ≤ 109).
It’s guaranteed that the sum of n of all test cases is less than 106
输出
For each test case, output the start city you should choose.
提示
For test case 1, both city 2 and 3 could be chosen as start point, 2 has smaller number. But if you start at city 1, you can’t go anywhere.
For test case 2, start from which city seems doesn’t matter, you just don’t have enough money to complete a trip.
样例输入
2
3 0
3 4 5
5 4 3
3 100
-3 -4 -5
30 40 50
样例输出
2
-1
队友的简洁代码：
#include <map>
#include <cstring>
#include <string>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <cctype>
#include <stack>
#include <list>
#include <queue>
#include <cmath>
#include <vector>
typedef long long ll;
using namespace std;
const int INF=1e6+5;
int t,n,c,a[INF],b[INF];
ll sum;
int main()
{
scanf("%d",&t);
while (t--)
{
scanf("%d%d",&n,&c);
memset(a,0,sizeof(a));
memset(b,0,sizeof(b));
for(int i=1;i<=n;i++)
{
scanf("%d",&a[i]);
}
for(int i=1;i<=n;i++)
{
scanf("%d",&b[i]);
}
for(int i=1;i<=n;i++)
{
sum=c;
sum+=a[i]-b[i];
if(sum<0)
continue;
int ix=i+1;
int cnt=1;
while(sum>=0)
{
if(ix>n&&cnt<n)//进行回溯
{
ix=1;
}
sum+=a[ix]-b[ix];
cnt++;//记录加过的个数
ix++;
if(cnt==n)//每个数都加过了，跳出
{
break;
}
}
if(sum>=0)//按从小到大的编号找，找到的第一个满足条件的sum，其编号一定是最小的
{
printf("%d\n",i);
break;
}
}
if(sum<0)
printf("-1\n");
}
return 0;
}
我的又臭又长的代码。。。想的太复杂了，果然T了：
#include<stdio.h>
#include<string>
#include<string.h>
#include<vector>
#include<list>
#include<queue>
#include<iostream>
#include<algorithm>
using namespace std;
#define INF 1000005
int t,n,c,a[INF],b[INF],num,sum;
int x[INF],ans;
pair<int,int> pa[INF];
typedef pair<int,int> p;
queue<p> que;
bool cmp(const p &a,const p &b)
{
if(a.first<b.first)
return true;
else
return false;
}
int main()
{
scanf("%d",&t);
while(t--)
{
while (!que.empty())
{
que.pop();
}
ans=INF;
num=-1;
scanf("%d%d",&n,&c);
sum=c;
for(int i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
for(int i=0;i<n;i++)
{
scanf("%d",&b[i]);
}
for(int i=0;i<n;i++)
{
x[i]=a[i]-b[i];
pa[i]=make_pair(x[i],i+1);
}
sort(pa,pa+n,cmp);
for(int i=0;i<n;i++)
{
que.push(pa[i]);
}
int nu=0;
while(1)
{
sum=c;
for(int i=0;i<n;i++)
{
p tmp=que.front();
if(sum>=0)
sum+=tmp.first;
que.pop();
que.push(tmp);
}
p y=que.front();
if(sum>=0)
ans=min(ans,y.second);
que.pop();
que.push(y);
nu++;
if(nu==n)
{
if(ans==INF)
printf("-1\n");
else
printf("%d\n",ans);
goto end;
}
}
end:
;
}
//system("puase");
return 0;
}