CodeForces 315B Sereja and Array （水）

 

 

#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<iostream>
using namespace std;

int a[300000];
int main()
{
    int n,m;
    int i,j,k;
    int op,num;
    scanf("%d%d",&n,&m);

        int add=0;
        for(i=1;i<=n;i++)
        {
            scanf("%d",&a[i]);
        }

        while(m--)
        {
            scanf("%d",&op);
            if(op==1)
        {
            scanf("%d%d",&i,&num);
            a[i]=num-add;
        }
        else if(op==2)
        {
            scanf("%d",&num);
            add+=num;
        }
        else if(op==3)
        {
            scanf("%d",&num);
            printf("%d\n",a[num]+add);
        }
        }

    return 0;
}

 

转载于:https://www.cnblogs.com/sola1994/p/4687912.html