Submission #2359

#	Time	Username	Problem	Language	Result	Execution time	Memory
2359		hgp744	지우개 (GA4_eraser)	C++98	46 / 100	14 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