Submission #565609

#	Time	Username	Problem	Language	Result	Execution time	Memory
565609		RealSnake	Xylophone (JOI18_xylophone)	C++14	Compilation error	0 ms	0 KiB

xylophone

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

int a[5001];

bool sol(int n, int j, int val) {
    a[j] = val;
    int b[n + 1];
    for(int i = j - 1; i >= 1; i--) {
        int x = query(i, i + 1);
        b[i] = x;
        if(i == j - 1) {
            a[i] = x + 1;
            if(val != 1)
                a[i] = val - x;
            continue;
        }
        int y = query(i, i + 2);
        if(a[i + 1] < a[i + 2]) {
            if(a[i + 1] + x < a[i + 2]) {
                if(y == b[i + 1])
                    a[i] = a[i + 1] + x;
                else
                    a[i] = a[i + 1] - x;
            }
            else {
                if(y == a[i + 2] - (a[i + 1] - x))
                    a[i] = a[i + 1] - x;
                else
                    a[i] = a[i + 1] + x;
            }
        }
        else {
            if(a[i + 1] - x > a[i + 2]) {
                if(y == b[i + 1])
                    a[i] = a[i + 1] - x;
                else
                    a[i] = a[i + 1] + x;
            }
            else {
                if(y == (a[i + 1] + x) - a[i + 2])
                    a[i] = a[i + 1] + x;
                else
                    a[i] = a[i + 1] - x;
            }
        }
    }
    for(int i = j + 1; i <= n; i++) {
        int x = query(i - 1, i);
        b[i] = x;
        if(i == j + 1) {
            a[i] = x + 1;
            if(val != 1)
                a[i] = val - x;
            continue;
        }
        int y = query(i - 2, i);
        if(a[i - 1] < a[i - 2]) {
            if(a[i - 1] + x < a[i - 2]) {
                if(y == b[i - 1])
                    a[i] = a[i - 1] + x;
                else
                    a[i] = a[i - 1] - x;
            }
            else {
                if(y == a[i - 2] - (a[i - 1] - x))
                    a[i] = a[i - 1] - x;
                else
                    a[i] = a[i - 1] + x;
            }
        }
        else {
            if(a[i - 1] - x > a[i - 2]) {
                if(b[i - 1] == y)
                    a[i] = a[i - 1] - x;
                else
                    a[i] = a[i - 1] + x;
            }
            else {
                if(y == (a[i - 1] + x) - a[i - 2])
                    a[i] = a[i - 1] + x;
                else
                    a[i] = a[i - 1] - x;
            }
        }
    }
    vector<int> ve;
    for(int i = 1; i <= n; i++)
        ve.push_back(a[i]);
    sort(ve.begin(), ve.end());
    for(int i = 1; i <= n; i++) {
        if(ve[i - 1] != i)
            return 0;
    }
    return 1;
}

void solve(int n) {
    int j = 1;
    for(int i = 1; i <= n; i++)
        a[i] = 0;
    for(int i = 1; i <= n; i++) {
        int x = query(i, n);
        if(x == n - 1)
            j = i;
        else
            break;
    }
    if(!sol(n, j, 1))
        sol(n, j, n);
    for(int i = 1; i <= n; i++)
        answer(i, a[i]);
}

Compilation message (stderr)

xylophone.cpp: In function 'bool sol(int, int, int)':
xylophone.cpp:87:5: error: 'vector' was not declared in this scope; did you mean 'std::vector'?
   87 |     vector<int> ve;
      |     ^~~~~~
      |     std::vector
In file included from /usr/include/c++/10/vector:67,
                 from /usr/include/c++/10/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:86,
                 from xylophone.cpp:1:
/usr/include/c++/10/bits/stl_vector.h:389:11: note: 'std::vector' declared here
  389 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
xylophone.cpp:87:12: error: expected primary-expression before 'int'
   87 |     vector<int> ve;
      |            ^~~
xylophone.cpp:89:9: error: 've' was not declared in this scope
   89 |         ve.push_back(a[i]);
      |         ^~
xylophone.cpp:90:10: error: 've' was not declared in this scope
   90 |     sort(ve.begin(), ve.end());
      |          ^~
xylophone.cpp:90:5: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   90 |     sort(ve.begin(), ve.end());
      |     ^~~~
      |     std::sort
In file included from /usr/include/c++/10/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
                 from xylophone.cpp:1:
/usr/include/c++/10/bits/stl_algo.h:4880:5: note: 'std::sort' declared here
 4880 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
      |     ^~~~