2015-2016 ACM-ICPC, NEERC, Moscow Subregional Contest C. Colder-Hotter

逃离我推掉我的手 2022-08-09 11:56 102阅读 0赞

交互题

首先三分x坐标，然后因为三分不准确，所以在附近震荡求精确值。  
其次同样的方法求出y坐标。

注意，询问次数的上限是500。  
每次询问的时候，(x,y)的两个坐标必须在\[0,1E9\]之间。

// whn6325689
    // Mr.Phoebe
    // http://blog.csdn.net/u013007900
    #include <algorithm>
    #include <iostream>
    #include <iomanip>
    #include <cstring>
    #include <climits>
    #include <complex>
    #include <fstream>
    #include <cassert>
    #include <cstdio>
    #include <bitset>
    #include <vector>
    #include <deque>
    #include <queue>
    #include <stack>
    #include <ctime>
    #include <set>
    #include <map>
    #include <cmath>
    #include <functional>
    #include <numeric>
    #pragma comment(linker, "/STACK:1024000000,1024000000")
    
    
    using namespace std;
    
    #define eps 1e-9
    #define PI acos(-1.0)
    #define INF 0x3f3f3f3f
    #define LLINF 1LL<<62
    #define speed std::ios::sync_with_stdio(false);
    
    typedef long long ll;
    typedef unsigned long long ull;
    typedef long double ld;
    typedef pair<ll, ll> pll;
    typedef complex<ld> point;
    typedef pair<int, int> pii;
    typedef pair<pii, int> piii;
    typedef vector<int> vi;
    
    #define CLR(x,y) memset(x,y,sizeof(x))
    #define CPY(x,y) memcpy(x,y,sizeof(x))
    #define clr(a,x,size) memset(a,x,sizeof(a[0])*(size))
    #define cpy(a,x,size) memcpy(a,x,sizeof(a[0])*(size))
    #define debug(a) cout << #a" = " << (a) << endl;
    #define debugarry(a, n) for (int i = 0; i < (n); i++) { cout << #a"[" << i << "] = " << (a)[i] << endl; }
    
    #define mp(x,y) make_pair(x,y)
    #define pb(x) push_back(x)
    #define lowbit(x) (x&(-x))
    
    #define MID(x,y) (x+((y-x)>>1))
    #define getidx(l,r) (l+r|l!=r)
    #define ls getidx(l,mid)
    #define rs getidx(mid+1,r)
    #define lson l,mid
    #define rson mid+1,r
    
    template<class T>
    inline bool read(T &n)
    {
        T x = 0, tmp = 1;
        char c = getchar();
        while((c < '0' || c > '9') && c != '-' && c != EOF) c = getchar();
        if(c == EOF) return false;
        if(c == '-') c = getchar(), tmp = -1;
        while(c >= '0' && c <= '9') x *= 10, x += (c - '0'),c = getchar();
        n = x*tmp;
        return true;
    }
    template <class T>
    inline void write(T n)
    {
        if(n < 0)
        {
            putchar('-');
            n = -n;
        }
        int len = 0,data[20];
        while(n)
        {
            data[len++] = n%10;
            n /= 10;
        }
        if(!len) data[len++] = 0;
        while(len--) putchar(data[len]+48);
    }
    //-----------------------------------
    int ansx, ansy;
    
    int main()
    {
        double xl = 0, xr = 1e9, yl = 0, yr = 1e9;
        for (int t = 1; t <= 100; t++)
        {
            double mid1 = (xl+xr)/2, mid2 = (mid1+xr)/2;
            int flag1, flag2;
            printf("%.0lf 0\n", mid1);
            fflush(stdout);
            scanf("%d", &flag1);
            printf("%.0lf 0\n", mid2);
            fflush(stdout);
            scanf("%d", &flag2);
            if (flag2)
            {
                xl = mid1;
                ansx = xl;
            }
            else
            {
                xr = mid2;
                ansx = xr;
            }
        }
        int tmp = ansx;
        for (int i = max(0, tmp-10); i <= min(1000000000, tmp+10); i++)
        {
            int flag;
            printf("%d 0\n", i);
            fflush(stdout);
            scanf("%d", &flag);
            if (flag) ansx = i;
        }
        for (int t = 1; t <= 100; t++)
        {
            double mid1 = (yl+yr)/2, mid2 = (mid1+yr)/2;
            int flag1, flag2;
            printf("%d %.0lf\n", ansx, mid1);
            fflush(stdout);
            scanf("%d", &flag1);
            printf("%d %.0lf\n", ansx, mid2);
            fflush(stdout);
            scanf("%d", &flag2);
            if (flag2)
            {
                yl = mid1;
                ansy = yl;
            }
            else
            {
                yr = mid2;
                ansy = yr;
            }
        }
        tmp = ansy;
        for (int i = max(0, tmp-10); i <= min(1000000000, tmp+10); i++)
        {
            int flag;
            printf("%d %d\n", ansx, i);
            fflush(stdout);
            scanf("%d", &flag);
            if (flag) ansy = i;
        }
        printf("A %d %d\n", ansx, ansy);
        return 0;
    }