CodeForces 6C

题目链接http://codeforces.com/problemset/problem/6/C

Alice and Bob like games. And now they are ready to start a new game. They have placed n chocolate bars in a line. Alice starts to eat chocolate bars one by one from left to right, and Bob — from right to left. For each chocololate bar the time, needed for the player to consume it, is known (Alice and Bob eat them with equal speed). When the player consumes a chocolate bar, he immediately starts with another. It is not allowed to eat two chocolate bars at the same time, to leave the bar unfinished and to make pauses. If both players start to eat the same bar simultaneously, Bob leaves it to Alice as a true gentleman.

How many bars each of the players will consume?
Input

The first line contains one integer n (1 ≤ n ≤ 105) — the amount of bars on the table. The second line contains a sequence t1, t2, ..., tn (1 ≤ ti ≤ 1000), where ti is the time (in seconds) needed to consume the i-th bar (in the order from left to right).
Output

Print two numbers a and b, where a is the amount of bars consumed by Alice, and b is the amount of bars consumed by Bob.
Sample test(s)
Input

5
2 9 8 2 7

Output

2 3

题目大意就是从Alice从左往右，Bob从右往左看谁吃了多少，简单贪心一步就完成

#include<stdio.h>
int a[100005];
int main()
{
    int m;
    scanf("%d",&m);
    int i,j;
    for(i=0;i<m;i++)scanf("%d",&a[i]);
    int p=a[0],q=a[m-1];//赋初值
    for(i=0,j=m-1;i<=j;i++,j--)//逐步比较
    {
        if(p<q){j+=1;q=q-p;p=a[i+1];}
        else if(p>q){i-=1;p-=q;q=a[j-1];}
        else if(p==q){p=a[i+1];q=a[j-1];}
    }
    printf("%d %d\n",i,m-i);
    return 0;
}