제출 #969426

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
969426		HasanV11010238	Rack (eJOI19_rack)	C++17	40 / 100	1 ms	348 KiB

rack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mod 1000000007
int am = 0;
ll binpow(ll a, ll b){
    ll res = 1;
    if (b == -1){
        return 0;
    }
    while (b != 0){
        if (b % 2 == 0){
            b /= 2;
            a *= a;
            if (a >= mod){
                am++;
            }
            a %= mod;
        }
        else{
            b -= 1;
            res *= a;
            if (res >= mod){
                am++;
            }
            res %= mod;
        }
    }
    return res;
}
vector<vector<ll>> ve;
ll ans = 1;
ll f(ll n, ll k, ll va){
    ll val = 0;
    if (n == 0){
        return 0;
    }
    am = 0;
    ll po = binpow(2, n - 1);
    if ((am == 0 && k >= po)){
        val += binpow(2, va);
        ve.push_back({n - 1, k - po, va + 1});
        ans += val;
        return 0;
    }
    else if ((am == 1 && k >= po * mod)){
        val += binpow(2, va);
        ve.push_back({n - 1, k - po * mod, va + 1});
        ans += val;
        return 0;
    }
    ve.push_back({n - 1, k, va + 1});
    ans += val;
    return 0;
}
int main(){
    ll n, k;
    cin>>n>>k;
    k--;
    ve.push_back({n, k, 0});
    for (int i = 0; i < ve.size(); i++){
        f(ve[i][0], ve[i][1], ve[i][2]);
        ans %= mod;
    }
    cout<<ans;
}

컴파일 시 표준 에러 (stderr) 메시지

rack.cpp: In function 'int main()':
rack.cpp:61:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     for (int i = 0; i < ve.size(); i++){
      |                     ~~^~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 60