Submission #2391

#	Time	Username	Problem	Language	Result	Execution time	Memory
2391		crazysoldier	지우개 (GA4_eraser)	C++98	46 / 100	12 ms	2940 KiB

eraser

#include <iostream>
#include <stdio.h>

using namespace std;
long long a[100009],b[100009];
int main()
{
    long long n,input,MaX,i,SizE=0;
    long long Sum=0,Mid=0,MiD=0;
    scanf("%lld",&n);
    scanf("%lld",&input); MaX=input; a[input]++;
    for(i=2;i<=n;i++)
    {
        scanf("%d",&input);
        a[input]++;
        if(MaX<input) MaX = input;
    }
    for(i=1;i<=MaX;i++)if(i*a[i])
    {
        SizE++;
        b[SizE]=i*a[i];
    }
    for(i=1;i<=SizE;i++) Mid += b[i];
    Sum += Mid*Mid*Mid;
    for(i=1;i<=SizE;i++) Sum += 2*b[i]*b[i]*b[i];
    Mid = 0;
    for(i=1;i<=SizE;i++){Mid+=b[i]*b[i]; MiD+=b[i];}
    Sum -= 3*Mid*MiD;
    printf("%lld",(Sum/6)%1000000007);
    return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 16 / 16
• Subtask 4: 17 / 17
• Subtask 5: 0 / 26
• Subtask 6: 0 / 28