Submission #697707

#	Time	Username	Problem	Language	Result	Execution time	Memory
697707		tvladm2009	Handcrafted Gift (IOI20_gift)	C++17	100 / 100	147 ms	22864 KiB

gift

#include <bits/stdc++.h>
#include "gift.h"

using namespace std;

typedef long long ll;

const int N_MAX = 500000;

int mars[N_MAX + 2], ok[N_MAX + 2];

int construct(int n, int r, vector <int> a, vector <int> b, vector <int> x) {
    for (int i = 0; i < r; i++) {
        a[i]++;
        b[i]++;
        if (a[i] == b[i] && x[i] == 2) {
            return 0;
        }
    }
    for (int i = 0; i < r; i++) {
        if (x[i] == 1) {
            mars[a[i]]++;
            mars[b[i] + 1]--;
        }
    }
    for (int i = 1; i <= n; i++) {
        mars[i] += mars[i - 1];
        if (mars[i] != 0) {
            ok[i] = ok[i - 1] + 1;
        }
    }
    for (int i = 0; i < r; i++) {
        if (x[i] == 1) {
            continue;
        }
        if (ok[b[i]] - ok[a[i] - 1] == b[i] - a[i] + 1) {
            return 0;
        }
    }
    string s = "R";
    for (int i = 1; i < n; i++) {
        if (ok[i + 1] <= 1) {
            if (s[i - 1] == 'R') {
                s += 'B';
            } else {
                s += 'R';
            }
        } else {
            s += s[i - 1];
        }
    }
    craft(s);
    return 1;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 20 / 20
• Subtask 4: 25 / 25
• Subtask 5: 30 / 30