結果
問題 | No.1830 Balanced Majority |
ユーザー |
|
提出日時 | 2022-02-04 22:48:44 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 30 ms / 2,000 ms |
コード長 | 2,130 bytes |
コンパイル時間 | 2,354 ms |
コンパイル使用メモリ | 196,292 KB |
最終ジャッジ日時 | 2025-01-27 19:34:42 |
ジャッジサーバーID (参考情報) |
judge4 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 1 |
other | AC * 25 |
ソースコード
//#define _GLIBCXX_DEBUG#include <bits/stdc++.h>#include <atcoder/modint>using namespace std;using namespace atcoder;using ll = long long;using mint = modint1000000007;#define rep(i,n) for (int i = 0; i < n; i++)#define rrep(i,n) for (int i = n-1; i >= 0; i--)#define rep2(i,a,b) for (int i = a; i < b; i++)#define rrep2(i,a,b) for (int i = a-1; i >= b; i--)#define all(v) v.begin(),v.end()#define rall(v) v.rbegin(),v.rend()#define minv(v) *min_element(all(v))#define maxv(v) *max_element(all(v))template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}template<class T> T pow(T x, T y){if (y == 0) return 1.0;T p = pow(x,y/2);if (y%2 == 0) return p*p;else return p*p*x;}int f(int s, int x){return 2*s-x;}int main(){int n; cin >> n;int s1, s2;cout << "? " << 1 << endl;cin >> s1;s1 = f(s1,1);cout << "? " << n-1 << endl;cin >> s2;s2 = f(s2,n-1);if (s1 == s2){cout << "! " << 2 << " " << n-1 << endl;}else if (s1 == 1){int l = 1, r = n-1;rep(i,18){int s, k = (l+r)/2;cout << "? " << k << endl;cin >> s;s = f(s,k);if (s == 0){if (k >= n/2) cout << "! " << 1 << " " << k << endl;else cout << "! " << k+1 << " " << n << endl;return 0;}if (s > 0){l = k;}else{r = k;}}}else{int l = 1, r = n-1;rep(i,18){int s, k = (l+r)/2;cout << "? " << k << endl;cin >> s;s = f(s,k);if (s == 0){if (k >= n/2) cout << "! " << 1 << " " << k << endl;else cout << "! " << k+1 << " " << n << endl;return 0;}if (s > 0){r = k;}else{l = k;}}}}