Submission #711944

#	Time	Username	Problem	Language	Result	Execution time	Memory
711944		sysia	Colors (BOI20_colors)	C++17	0 / 100	1 ms	208 KiB

Colors

//Sylwia Sapkowska
#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
using namespace std;

void __print(int x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef LOCAL
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

#define int long long
typedef pair<int, int> T;
const int oo = 1e18, oo2 = 1e9+7, K = 30;
const int mod = 998244353;

void solve(){
    int n; cin >> n;
    int mid = (1+n)/2;
    int l = (mid+1)/2;
    int len = 1;
    while (len<=n) len*=2;
    len/=2;
    int r = min(n, l+len);
    debug(1, l, r, n);
    int ans = oo;
    int prev = oo;
    auto ask = [&](int x){
        cout << "? " << x << "\n";
        cout.flush();
        bool a; cin >> a;
        if (a) {
            ans = min(ans, abs(x-prev));
            debug(x, prev);
        }
        prev = x;
        return a;
    };
    ask(l);
    bool what = ask(r);
    bool right = 1;
    while (len>1){
        len/=2;
        debug(l, r, len);
        if (!what){
            if (right){
                l = max(1LL, l-len); 
                what = ask(l);
            } else {
                r = min(n, r+len);
                what = ask(r);
            }
        } else {
            if (right){
                l = min(n, l+len);
                what = ask(l);
            } else {
                r = max(1LL, r-len);
                what = ask(r);
            }
        }
        right ^= 1;
    }
    debug(l, r);
    cout << "= " << ans << "\n";
    cout.flush();
}

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    // cin >> t;
    while (t--) solve();

    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33