Submission #57916

#	Time	Username	Problem	Language	Result	Execution time	Memory
57916		paulica	Xylophone (JOI18_xylophone)	C++14	100 / 100	119 ms	840 KiB

xylophone

#include "xylophone.h"

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

void solve(int n) {
    int a[5010], d[5010];

    for (int i = 0; i < n - 1; i++)
        d[i] = query(i + 1, i + 2);

    int sign = 1;
    a[0] = 0;
    a[1] = d[0];

    for (int i = 1; i < n - 1; i++) {
        if (query(i, i + 2) != (d[i - 1] + d[i]))
            sign = -sign;

        a[i + 1] = a[i] + sign * d[i];
    }

    int posMin = 0, posMax = 0;
    for (int i = 1; i < n; i++) {
        if (a[i] < a[posMin]) posMin = i;
        if (a[i] > a[posMax]) posMax = i;
    }

    if (posMin > posMax) {
        for (int i = 1; i < n; i++) a[i] = -a[i];
        swap(posMin, posMax);
    }

    for (int i = 0; i < n; i++)
        answer(i + 1, a[i] - a[posMin] + 1);
}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:14:15: warning: 'd[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
     a[1] = d[0];
            ~~~^

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