Submission #996129

#	Time	Username	Problem	Language	Result	Execution time	Memory
996129		reginox	Xylophone (JOI18_xylophone)	C++17	Compilation error	0 ms	0 KiB

xylophone

#include<bits/stdc++.h>
#include "xylophone.h"
#define ll long long
#define all(v) begin(v), end(v)
#define pi pair<int, int>
#define vi vector<int>
using namespace std;
int a[5005];
int p1[5005], p2[5005];

bool try(int u, int v){
    if(v < 1 || v > n) return ;
    a[1] = u, a[2] = v;
    for(int i = 3; i <= n; i++){
        int d1 = p1[i], d2 = p2[i], d3 = abs(a[i-2] - a[i-1]);
        if(a[i-2] > a[i-1]){
            if(d3 + d1 == d2){
                a[i] = a[i-1] - d1;
            }
            else if(d2 == d3){
                a[i] = a[i-1] + d1;
            }
            else{
                a[i] = a[i-1] + d2;
            }
        }
        else{
            if(d1 == d2){
                a[i] = a[i-1] - d1;
            }
            else if(d3 == d2){
                a[i] = a[i-1] + d1;
            }
            else{
               a[i] = a[i-1] + d2; 
            }
        }
    }
    vector<bool> ch(n, false);
    for(int i = 1; i <= n; i++){
        if(ch[a[i]-1]) return false;
        ch[a[i]-1] = true;
    }
    return true;
}

void solve(int n){
    int d = query(1, 2);
    for(int i = 3; i <= n; i++){
        p1[i] = query(i-1, i), p2[i] = query(i-2, i);
    }
    for(int v1 = 1; v1 <= n; i++){
        for(int z = -d; z <= d; z+=2*d){
            if(try(v1, v1+z)){
                for(int i = 1; i <= n; i++) answer(i, a[i]);
                return ;
            }
        }
    }
}

Compilation message (stderr)

xylophone.cpp:11:6: error: expected unqualified-id before 'try'
   11 | bool try(int u, int v){
      |      ^~~
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:52:30: error: 'i' was not declared in this scope
   52 |     for(int v1 = 1; v1 <= n; i++){
      |                              ^
xylophone.cpp:54:16: error: expected primary-expression before 'try'
   54 |             if(try(v1, v1+z)){
      |                ^~~
xylophone.cpp:54:16: error: expected ')' before 'try'
   54 |             if(try(v1, v1+z)){
      |               ~^~~
      |                )