Submission #697275

#	Time	Username	Problem	Language	Result	Execution time	Memory
697275		youngyojun	Handcrafted Gift (IOI20_gift)	C++17	100 / 100	146 ms	24920 KiB

gift

#include "gift.h"
#include <bits/stdc++.h>
using namespace std;

int construct(int N, int K, vector<int> A, vector<int> B, vector<int> C) {
	vector<int> D(N);
	for(int i = K; i--;) if(1 == C[i] && A[i] != B[i]) {
		D[A[i]]++; D[B[i]]--;
	}
	for(int i = 1; i < N; i++) D[i] += D[i-1];

	vector<int> E(N);
	for(int i = 1, c = 0; i < N; i++) {
		if(!D[i-1]) c ^= 1;
		E[i] = c;
	}

	for(int i = N; i--;) D[i] = 0;
	for(int i = 1; i < N; i++) D[i-1] = E[i-1] ^ E[i];
	for(int i = 1; i < N; i++) D[i] += D[i-1];

	for(int i = K; i--;)
		if(2 == C[i] && (A[i] == B[i] || D[B[i]-1] == (A[i] ? D[A[i]-1] : 0)))
			return 0;
	
	string ret;
	for(int i = 0; i < N; i++) ret += E[i] ? 'R' : 'B';
	craft(ret);

	return 1;
}

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