Submission #302154

#	Time	Username	Problem	Language	Result	Execution time	Memory
302154		dantoh000	The Big Prize (IOI17_prize)	C++14	20 / 100	60 ms	512 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
int mx = 0;
int ans = -1;
vector<int> pos;
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){
    if (c == 0) return;
    //printf("searching %d %d %d %d %d\n",L,R,cl,cr,c);
     if (L == R){
        //printf("add pos %d\n",L);
        //printf("check: %d\n",g[L]);
        pos.push_back(L);
        return;
    }
    if (L > R) return;
    int mid = (L+R)/2;
    //printf("mid %d\n",mid);
    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 (c == 0) return;
    //printf("search <%d,%d><%d,%d>, <%d,%d>, %d\n",ll,lr,rl,rr,cl,cr,c);
    if (ll == rr){
        search(ll, rr, cl, cr, c);
        return;
    }
    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];
    //printf("queried %d, got (%d,%d)\n",q,CL,CR);
    if (CL + CR != mx){ /// is special
        //printf("add pos %d\n",q);
       // printf("check: %d\n",g[q]);
        pos.push_back(q);
        if (q == lr){
            if (ll <= lr-1) search(ll, lr-1, rl, rr, cl, cr, c-1);
            else search(rl, rr, cl+1, 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+1, 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);
   // printf("%d , %d\n",pos.size(),nonmax);
    for (auto x : pos){
        vector<int> p = ask(x);
        if (p[0] + p[1] == 0) return x;
    }
    assert(false);
}

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