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AtCoder Beginner Contest 464

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A - Decisive Battle

問題文

EWを数えてn / 2 < cntで判定すると答えが出ます。

C++
#include <bits/stdc++.h>
 
#define rep(i,n) for(int i=0; i<(n); ++i)
#define repx(i,x,n) for(int i=x; i<(n); ++i)
#define fixed_setprecision(n) fixed << setprecision((n))
#define execution_time(ti) printf("Execution Time: %.4lf sec\n", 1.0 * (clock() - ti) / CLOCKS_PER_SEC);
#define pai 3.1415926535897932384
#define NUM_MAX 2e18
#define NUM_MIN -1e9
 
using namespace std;
using ll = long long;
using P = pair<int,int>;
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; }

int main() {
    string s;
    cin >> s;
    int n = s.size();
    int cnt = 0;
    rep(i, n){
        if(s[i] == 'E') cnt++;
    }
    if(n / 2 < cnt) cout << "East" << endl;
    else cout << "West" << endl;
    return 0;
} 

B - Crop

問題文

4方向からシミュレーションしました。

C++
#include <bits/stdc++.h>
 
#define rep(i,n) for(int i=0; i<(n); ++i)
#define repx(i,x,n) for(int i=x; i<(n); ++i)
#define fixed_setprecision(n) fixed << setprecision((n))
#define execution_time(ti) printf("Execution Time: %.4lf sec\n", 1.0 * (clock() - ti) / CLOCKS_PER_SEC);
#define pai 3.1415926535897932384
#define NUM_MAX 2e18
#define NUM_MIN -1e9
 
using namespace std;
using ll = long long;
using P = pair<int,int>;
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; }

int main() {
    int h, w;
    cin >> h >> w;
    vector<string> c(h);
    rep(i, h) cin >> c[i];

    int x1=0, x2=w;
    int y1=0, y2=h;  

    for(int y=0; y<h; y++){
        int cnt=0;
        for(int x=0; x<w; x++){
            if(c[y][x] == '.') cnt++;
        }
        if(w == cnt) y1++;
        else break;
    }

    for(int y=h-1; y>=0; y--){
        int cnt=0;
        for(int x=0; x<w; x++){
            if(c[y][x] == '.') cnt++;
        }
        if(w == cnt) y2--;
        else break;
    }

    for(int x=0; x<w; x++){
        int cnt=0;
        for(int y=0; y<h; y++){
            if(c[y][x] == '.') cnt++;
        }
        if(h == cnt) x1++;
        else break;
    }

    for(int x=w-1; x>=0; x--){
        int cnt=0;
        for(int y=0; y<h; y++){
            if(c[y][x] == '.') cnt++;
        }
        if(h == cnt) x2--;
        else break;
    }

    for(int y=y1; y<y2; y++){
        for(int x=x1; x<x2; x++){
            cout << c[y][x];
        }
        cout << endl;
    }

    return 0;
} 

C - Plumage Palette

問題文

データ構造の問題です。
1~m日までの日付を全て探索します。
色が変わる日はmapで判定するとO(1)で判定でき、変更される色を加算、減算します。

C++
#include <bits/stdc++.h>
 
#define rep(i,n) for(int i=0; i<(n); ++i)
#define repx(i,x,n) for(int i=x; i<(n); ++i)
#define fixed_setprecision(n) fixed << setprecision((n))
#define execution_time(ti) printf("Execution Time: %.4lf sec\n", 1.0 * (clock() - ti) / CLOCKS_PER_SEC);
#define pai 3.1415926535897932384
#define NUM_MAX 2e18
#define NUM_MIN -1e9
 
using namespace std;
using ll = long long;
using P = pair<int,int>;
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; }

int main() {
    int n, m;
    cin >> n >> m;
    map<int, vector<pair<int, int>>> mp;
    map<int, int> ans;
    rep(i, n){
        int a, d, b;
        cin >> a >> d >> b;
        ans[a]++;
        mp[d].emplace_back(a, b);
    }

    rep(i, m){
        if(mp.find(i+1) != mp.end()){
            for(auto [a, b]:mp[i+1]){
                ans[a]--;
                if(ans[a] == 0) ans.erase(a);
                ans[b]++;
            }
        }
        cout << ans.size() << endl; 
    }

    return 0;
} 

問題文

C++
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