Submission #40216

#	Time	Username	Problem	Language	Result	Execution time	Memory
40216		jackyliuxx	The Big Prize (IOI17_prize)	C++14	20 / 100	33 ms	2684 KiB

prize

#include "prize.h"
// #include <iostream>
#include <map>
using namespace std;

map<int, map<int, pair<int, int>>> resmap;

void resmap_push(int i, int lc, int rc) {
    resmap[lc + rc][i] = {lc, rc};
}

int gogo(int fr, int to) {
    // cout << "go " << fr << ' ' << to << endl;
    for (auto &rsmp : resmap) {
        auto &mp = rsmp.second;
        auto lb = mp.lower_bound(fr);
        auto ub = mp.upper_bound(to);
        pair<int, int> lres, rres;
        // cout << "check " << rsmp.first << endl;
        if (lb == mp.begin()) {
            // cout << "no lb" << endl;
            lres = {0, rsmp.first};
        } else {
            lb--;
            // cout << "lb " << lb->first << endl;
            lres = lb->second;
        }
        if (ub == mp.end()) {
            // cout << "no ub" << endl;
            rres = {rsmp.first, 0};
        } else {
            // cout << "ub " << ub->first << endl;
            rres = ub->second;
        }
        if (lres.first == rres.first) {
            // cout << "skip" << endl;
            return -1;
        }
    }
    if (to <= fr) {
        return -1;
    }
    int mid = (fr + to) / 2;
    vector<int> res = ask(mid);
    resmap_push(mid, res[0], res[1]);
    if (res[0] + res[1] == 0) {
        return mid;
    } else {
        int lrt = gogo(fr, mid);
        if (lrt == -1) {
            return gogo(mid + 1, to);
        } else {
            return lrt;
        }
    }
}

int find_best(int n) {
    resmap.clear();
    return gogo(0, n);
}

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