2.摘桃子-BIT小学期

#include<stdio.h>  
int main()  
{  
    int Peach[3001]={0};  
    int n,v,i,j,Day,num,Sum=0,M=0;  
    scanf("%d %d",&n,&v);  
    for(i=0;i<n;i++)  
    {  
        scanf("%d %d",&Day,&num);  
        Peach[Day-1]=Peach[Day-1]+num;  
        if(M<Day)  
        M=Day;  
    }  
    for(j=0;j<M+1;j++)  
    {  
        if(Peach[j]<v)  
        Sum=Sum+Peach[j];  
        else  
        {  
            Sum=Sum+v;  
            if(Peach[j]<2*v)  
            Peach[j+1]=Peach[j+1]+Peach[j]-v;  
            else  
            Peach[j+1]=Peach[j+1]+v;  
        }  
    }  
    printf("%d\n",Sum);  
}