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AtCoder 生活111日目

Posted at

前回

#111日目
今日は、灰色を2問と茶色2問を解きました。

|問題|難易度|自力で解けた|かかった時間|
|:-:|:-:|:-:|---|---|
|ABC044|B|◯|12分56秒|
|AGC014|A|✕|77分2秒|
|ABC131|D|◯|13分43秒|
|ARC081|C|✕|123分14秒|

##ABC044_B


#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0;i < (n);i++)
using namespace std;
using ll = long long;
using pii = pair<int,int>;

const int INF = 2e9;

int main(){
    string s;
    cin >> s;
    sort(s.begin(),s.end());
    char r = s[0];
    int c = 1;
    bool ok = true;
    for(int i = 1;i < s.size();i++){
        if(s[i] == r)c++;
        else {
            if(c % 2 != 0)ok = false;
            c = 1;
            r = s[i];
        }
    }
    if(c % 2 != 0)ok = false;
    if(ok)cout << "Yes" << endl;
    else cout << "No" << endl;
}

解くのにかかった時間:12分56秒

##AGC014_A


#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0;i < (n);i++)
using namespace std;
using ll = long long;
using pii = pair<int,int>;

const int INF = 2e9;

int main(){
    ll a,b,c;
    cin >> a >> b >> c;
    rep(i,100000){
        if(a%2 || b%2 || c%2 ){
            cout << i << endl;
            return 0;
        }
        ll x = a/2;
        ll y = b/2;
        ll z = c/2;
        a = x+y;
        b = y+z;
        c = z+x;
    }
    cout << -1 << endl;
}

解くのにかかった時間:77分2秒
感想:なかなかに理解が進まなかった。

##ABC131_D


#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0;i < (n);i++)
using namespace std;
using ll = long long;
using pii = pair<int,int>;

const int INF = 2e9;

int main(){
    int n;
    cin >> n;
    vector<pii> x(n);
    rep(i,n){
        int a,b:
        cin >> a >> b;
        x[i].first = b;
        x[i].second = a;
    }
    sort(x.begin(),x.end());
    ll t = 0;
    rep(i,n){
        t += x[i].second;
        if(t > x[i].first){
            cout << "No" << endl;
            return 0;
        }
    }
    cout << "Yes" << endl;
}

解くのにかかった時間:13分43秒

##ARC081_C


#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0;i < (n);i++)
using namespace std;
using ll = long long;
using pii = pair<int,int>;

const int INF = 2e9;

int main(){
    int n;
    cin >> n;
    vector<int> v;
    map<int,int> mp;
    rep(i,n){
        int s;
        cin >> s;
        mp[s]++;
        if(mp[s] == 2){
            mp[s] = 0;
            v.push_back(s);
        }
    }
    sort(v.rbegin(),v.rend());
    ll ans = 0;
    if(2 <= v.size())ans = 1LL*v[0]*v[1];
    cout << ans << endl;
}

解くのにかかった時間:123分14秒
感想:mapの使い方を忘れていた。

###最後に
ABC以外がレートより少し難しくなってきた気がする

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