Codeforces Round #679 (Div. 2, based on Technocup 2021 Elimination Round 1) (个人题解）

1434A. Finding Sasuke

// Author : RioTian
// Time : 20/10/25
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll _, n;
void solve() {
    cin >> n;
    int a[n + 1];
    for (int i = 0; i < n; ++i) cin >> a[i];
    for (int i = 0; i < n; i += 2) cout << a[i + 1] << ' ' << -a[i] << ' ';
    cout << endl;
}
int main() {
    // freopen("in.txt", "r", stdin);
    ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
    cin >> _;
    while (_--) solve();
}

1435B. A New Technique

// Author : RioTian
// Time : 20/10/25
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 500 + 10;
int T;

int n, m, a[N][N], b[N][N], to[N * N];
bool mark[N * N];

int main(){
    ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
    cin >> T;
    while (T--) {
        cin >> n >> m;

        for (int i = 0; i <= n * m; i++)
            mark[i] = to[i] = 0;
        
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++)
                cin >> a[i][j];
            
            mark[a[i][0]] = 1;
            to[a[i][0]] = i;
        }

        for (int i = 0; i < m; i++)
            for (int j = 0; j < n; j++)
                cin >> b[i][j];

        for (int k = 0; k < m; k++)
            if (mark[b[k][0]]){
                for (int ii = 0; ii < n; ii++) {
                    int i = to[b[k][ii]];

                    for (int j = 0; j < m; j++) cout << a[i][j] << ' ';
                    cout << '\n';
                }

                break;
            }
    }
}