Submission #302135

#	Time	Username	Problem	Language	Result	Execution time	Memory
302135		dantoh000	The Big Prize (IOI17_prize)	C++14	20 / 100	57 ms	384 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
int mx = 0;
int ans = -1;
void search(int ll, int lr, int rl, int rr, int cl, int cr, int c);
void search(int L, int R, int cl, int cr, int c){
    //printf("searching %d %d %d %d %d\n",L,R,cl,cr,c);
     if (L == R){
        assert(L >= 0);
        vector<int> p = ask(L);
        int CL = p[0], CR = p[1];
        if (CL + CR != mx){ /// is special
            if (CL == 0 && CR == 0) ans = L;
        }
        return;
    }
    if (L > R) return;
    int mid = (L+R)/2;
    search(L, mid, mid+1, R, cl, cr, c);
    return;
}
void search(int ll, int lr, int rl, int rr, int cl, int cr, int c){
    if (ans != -1 || c == 0) return;
    //printf("search <%d,%d><%d,%d>, <%d,%d>, %d\n",ll,lr,rl,rr,cl,cr,c);
    int CL, CR;
    int q = (rr-rl)>(lr-ll)?rl:lr;
    assert(q >= 0);
    vector<int> p = ask(q);
    CL = p[0], CR = p[1];
    if (CL + CR != mx){ /// is special
        if (CL == 0 && CR == 0) {
            ans = q; return;
        }
        else{
            if (q == lr){
                if (ll <= lr-1) search(ll, lr-1, rl, rr, cl, cr, c-1);
                else search(rl, rr, cl, cr, c-1);

            }
            else if (q == rl){
                if (rl+1 <= rr) search(ll, lr, rl+1, rr, cl, cr, c-1);
                else search(ll, lr, cl, cr, c-1);
            }
        }
        return;
    }
    CR -= cr;
    CL -= cl;
    if (q == lr){
        if (ll <= lr-1) search(ll, lr-1,cl,CR+cr,CL);
        search(rl, rr,CL+cl,cr,CR);
    }
    else{
        search(ll, lr,cl,CR+cr,CL);
        if (rl+1 <= rr) search(rl+1, rr,CL+cl,cr,CR);
    }
}
int find_best(int n) {

    for (int i = 0; i < min(n,231); i++){
        vector<int> p = ask(i);
        //if (p[0] == 0 && p[1] == 0) return i;
        mx = max(mx,p[0]+p[1]);
    }
    int L, R;
    L = 0, R = n-1;
    int mid = (L+R)/2;
    search(L, mid, mid+1, R, 0, 0, mx);
    //assert(ans != -1);
	return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80