結果

問題 No.1918 Simple Math ?
ユーザー milanis48663220milanis48663220
提出日時 2022-04-29 22:38:28
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 1,414 ms / 2,000 ms
コード長 4,384 bytes
コンパイル時間 1,237 ms
コンパイル使用メモリ 119,148 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-06-29 04:14:15
合計ジャッジ時間 18,274 ms
ジャッジサーバーID
(参考情報)
judge3 / judge2
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 139 ms
6,812 KB
testcase_01 AC 7 ms
6,940 KB
testcase_02 AC 8 ms
6,940 KB
testcase_03 AC 6 ms
6,940 KB
testcase_04 AC 9 ms
6,940 KB
testcase_05 AC 9 ms
6,944 KB
testcase_06 AC 131 ms
6,944 KB
testcase_07 AC 70 ms
6,940 KB
testcase_08 AC 32 ms
6,944 KB
testcase_09 AC 31 ms
6,940 KB
testcase_10 AC 101 ms
6,940 KB
testcase_11 AC 13 ms
6,940 KB
testcase_12 AC 118 ms
6,944 KB
testcase_13 AC 125 ms
6,940 KB
testcase_14 AC 15 ms
6,944 KB
testcase_15 AC 23 ms
6,940 KB
testcase_16 AC 614 ms
6,940 KB
testcase_17 AC 658 ms
6,940 KB
testcase_18 AC 897 ms
6,944 KB
testcase_19 AC 957 ms
6,944 KB
testcase_20 AC 796 ms
6,940 KB
testcase_21 AC 1,352 ms
6,944 KB
testcase_22 AC 1,336 ms
6,940 KB
testcase_23 AC 1,339 ms
6,940 KB
testcase_24 AC 1,308 ms
6,940 KB
testcase_25 AC 1,333 ms
6,944 KB
testcase_26 AC 1,402 ms
6,944 KB
testcase_27 AC 1,414 ms
6,944 KB
testcase_28 AC 66 ms
6,940 KB
testcase_29 AC 2 ms
6,940 KB
testcase_30 AC 2 ms
6,940 KB
testcase_31 AC 1,411 ms
6,944 KB
testcase_32 AC 3 ms
6,944 KB
testcase_33 AC 2 ms
6,940 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    if(v.empty()) {
        cout << endl;
        return;
    }
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

const ll MOD = 1000000007;

class ModInt{
    public:
    ll v;
    ModInt(ll _v = 0){
        if(_v < 0) _v = (_v%MOD)+MOD;
        if(_v >= MOD) _v %= MOD;
        v = _v;
    }
    ModInt operator+(ll n){
        return ModInt((v+n)%MOD);
    }
    ModInt operator-(ll n){
        return ModInt((v-n+MOD)%MOD);
    }
    ModInt operator*(ll n){
        if(n >= MOD) n %= MOD;
        return ModInt((v*n)%MOD);
    }
    ModInt operator/(ll n){
        return ModInt((ModInt(n).inv()*v).v%MOD);
    }

    ModInt &operator+=(ll n){
        v = (v+n)%MOD;
        return *this;
    }
    ModInt &operator-=(ll n){
        v = (v-n+MOD)%MOD;
        return *this;
    }
    ModInt &operator*=(ll n){
        v = (v*n+MOD)%MOD;
        return *this;
    }
    
    
    ModInt operator+(ModInt n){
        return ModInt((v+n.v)%MOD);
    }
    ModInt operator-(ModInt n){
        return ModInt((v-n.v+MOD)%MOD);
    }
    ModInt operator*(ModInt n){
        return ModInt((v*n.v)%MOD);
    }
    ModInt operator/(ModInt n){
        return ModInt((n.inv()*v).v%MOD);
    }

    ModInt &operator+=(ModInt n){
        v = (v+n.v)%MOD;
        return *this;
    }
    ModInt &operator-=(ModInt n){
        v = (v-n.v+MOD)%MOD;
        return *this;
    }
    ModInt &operator*=(ModInt n){
        v = (v*n.v)%MOD;
        return *this;
    }

    bool operator==(ModInt n){
        return v == n.v;
    }
    bool operator!=(ModInt n){
        return v != n.v;
    }
    ModInt &operator=(ll n){
        v = n%MOD;
        return *this;
    }

    ModInt inv(){
        if(v == 1) return ModInt(1);
        else return ModInt(MOD-ModInt(MOD%v).inv().v*(MOD/v)%MOD);
    }
};

ostream& operator<<(ostream& os, const ModInt& m){
    os << m.v;
    return os;
}

istream & operator >> (istream &in,  ModInt &m){
    in >> m.v;
    return in;
}

ModInt pow(ModInt a, ll n) {
    assert(n >= 0);
	ModInt ans = 1;
    while (n > 0) {
        if (n&1) ans = ans*a;
        a = a*a;
        n >>= 1;
    }
	return ans;
}

using mint = ModInt;

// calc ceil(a/b) 
template<typename T>
T ceil_div(T a, T b){
    return (a+b-1)/b;
}

mint calc_sum_square(ll n){
    return mint((n*(n+1)*(2*n+1))/6);
}

mint calc_sum(ll n){
    return mint((n*(n+1))/2);
}

void solve(){
    ll a, n; cin >> a >> n;
    mint ans = 0;
    for(ll r = 0; r < a; r++){
        ll extra = ceil_div(r*r, a);
        auto f = [&](ll x){
            return a*x*x+2*x*r+extra;
        };
        auto calc_rb = [&](){
            ll l = 0, r = (1e6)+100;
            while(r-l > 1){
                ll x = (l+r)/2;
                if(f(x) > n) r = x;
                else l = x;
            }
            return l;
        };
        ll lb = r == 0 ? 1 : 0;
        if(f(lb) > n){
            continue;
        }
        ll rb = calc_rb();
        mint tmp = mint(rb-lb+1)*(n+1-extra);
        tmp -= calc_sum_square(rb)*a - calc_sum_square(lb-1)*a;
        tmp -= calc_sum(rb)*r*2 - calc_sum(lb-1)*r*2;
        ans += tmp;
        // cout << r << ' ' << tmp << endl;
    }
    cout << ans << endl;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int t; cin >> t;
    while(t--) solve();
}
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