Submission #19771

#	Time	Username	Problem	Language	Result	Execution time	Memory
19771		exqt	창문 (kriii4_C)	C++98	3 / 100	0 ms	1720 KiB

C

#include <iostream>
#include <algorithm>
#include <vector>
#include <sstream>
#include <fstream>

#include <iterator>
using namespace std;
 
#define in cin
#define out cout
 
#define ll long long int
#define pii pair<ll, ll>
#define pdd pair<double, double>
 
#define X first
#define Y second
 
ll DV = 1000000007LL;
ll pow(ll a, ll b)
{
    ll t = a;
    ll res = 1LL;
    while(b)
    {
        if(b%2) res = (res * t) % DV;
        t = t % DV;
        t = (t*t) % DV;
        b = b >> 1;
    }
 
    return res;
}
 
ll inv(ll a)
{
    return pow(a, DV-2)%DV;
}
 
ll mul(ll a, ll b)
{
    return ((a%DV)*(b%DV))%DV;
}
 
ll sub(ll a, ll b)
{
    a += 2LL*DV;
    b += 2LL*DV;
    return ((a%DV)-(b%DV)+10LL*DV)%DV;
}
 
ll add(ll a, ll b)
{
    return ((a%DV)+(b%DV))%DV;
}
 
 
int main()
{
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);
 
    ll w, h; in >> w >> h;
    w %= DV; h %= DV;
    ll wS = mul( mul(w, w+1LL), inv(2LL) );
    ll hS = mul( mul(h, h+1LL), inv(2LL) );
    ll wS2 = mul( mul(w, w+1LL), mul(mul(2LL,w)+1LL, inv(6LL)) );
    ll hS2 = mul( mul(h, h+1LL), mul(mul(2LL,h)+1LL, inv(6LL)) );
 
    ll res = 0;
    res = add(res, mul( mul(wS, hS),  mul(w,h) ));
    res = sub(res, mul( mul(wS, hS2),  mul(w,1LL) ));
    res = add(res, mul( mul(wS, hS),  mul(w,1LL) ));
    res = sub(res, mul( mul(wS2, hS),  mul(1LL,h) ));
    res = add(res, mul( mul(wS2, hS2),  mul(1LL,1LL) ));
    res = sub(res, mul( mul(wS2, hS),  mul(1LL,1LL) ));
    res = add(res, mul( mul(wS, hS),  mul(1LL,h) ));
    res = sub(res, mul( mul(wS, hS2),  mul(1LL,1LL) ));
    res = add(res, mul( mul(wS, hS),  mul(1LL,1LL) ));
 
    res = mul(res, mul(inv(hS), inv(wS)));
    res = (res*9LL)%DV;
 
    out << res;
 
    return 0;
}

• Subtask 1: 3 / 3
• Subtask 2: 0 / 97