제출 #777813

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
777813		OrazB	Xylophone (JOI18_xylophone)	C++17	0 / 100	0 ms	208 KiB

xylophone

#include <bits/stdc++.h>
#include "xylophone.h"
using namespace std;
#define wr cout << "Continue debugging\n";
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <int, int>
#define pb push_back
#define ff first
#define ss second

int F(int n){
	int l = 1, r = n-1, pos;
	while(l <= r){
		if (l == r){
			pos = l;
			break;
		}
		int md = (l+r)>>1;
		int x = query(md, n);
		if (x != n-1) r = md - 1;
		else{
			pos = md;
			l = md + 1;
		}
	}
	return pos;
}

void solve(int n){
	int pos = F(n);
	vector<int> a(n+1);
	a[pos] = 1;
	a[pos+1] = 1+query(pos, pos+1);
	if (pos > 1) a[pos-1] = 1+query(pos-1, pos);
	for (int i = pos-2; i >= 1; i--){
		a[i] = a[i+1];
		int x = query(i, i+1), y = query(i, i+2);
		if (x == y){
			if (a[i+1] > a[i+2]) a[i] -= x;
			else a[i] += x;
		}else{
			if (a[i+1] > a[i+2]) a[i] += x;
			else a[i] -= x;
		}
	}
	for (int i = pos+2; i <= n; i++){
		a[i] = a[i-1];
		int x = query(i-1, i), y = query(i-2, i);
		if (x == y){
			if (a[i-1] > a[i-2]) a[i] -= x;
			else a[i] += x;
		}else{
			if (a[i-1] > a[i-2]) a[i] += x;
			else a[i] -= x;
		}
	}
	for (int i = 1; i <= n; i++) answer(i, a[i]);
}

컴파일 시 표준 에러 (stderr) 메시지

xylophone.cpp: In function 'int F(int)':
xylophone.cpp:27:9: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   27 |  return pos;
      |         ^~~
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:34:20: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |  a[pos+1] = 1+query(pos, pos+1);
      |               ~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 36
• Subtask 3: 0 / 53