CodeTON Round 1 (Div. 1 + Div. 2, Rated, Prizes!) A ~ D
A.
给定一个序列,对于任意1<=k<=n 都满足|ai−ak|+|ak−aj|=|ai−aj|,
找满足条件的i和j并输出
思路:
观察样例,发现输出的是最大值和最小值,那么猜答案是最大值和最小值,进行证明
若答案不是最大值和最小值,则一定存在一个k使得|ak-ap|大于|aj-ai| 一定不满足|ai−ak|+|ak−aj|=|ai−aj| 与命题矛盾
所以记录最大值和最小值 输出即可。
代码:
#include <bits/stdc++.h> using namespace std; #define x first #define y second #define endl " " #define int long long #define debug(x) cout << "*" << x << endl; const int P = 13131; #define ll long long const int mod = 1E6 + 7; const int INF = 0x3f, sINF = 0x3f3f3f3f; typedef unsigned long long ULL; typedef pair<int, int> PII; typedef pair<long long, long long> PLL; int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1}; const int N = 3e5 + 10;; int T; const int UN = 1e9 + 10; signed main() { cin>>T; while(T--) { int n; int maxa = 0, mina = UN; cin>>n; int ans1, ans2; for(int i = 1; i <= n; i++) { int temp; cin>>temp; if(temp > maxa) { ans1 = i; maxa = temp; } if(temp < mina) { ans2 = i; mina = temp; } } if(n == 1) cout<<"1 1"<<endl; else cout<<ans2<<" "<<ans1<<endl; } }
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自学咖网 » CodeTON Round 1 (Div. 1 + Div. 2, Rated, Prizes!) A ~ D
自学咖网 » CodeTON Round 1 (Div. 1 + Div. 2, Rated, Prizes!) A ~ D