Submission #1189938

#	Time	Username	Problem	Language	Result	Execution time	Memory
1189938		Panda50O	Xylophone (JOI18_xylophone)	C++20	Compilation error	0 ms	0 KiB

xylophone

#include "xylophone.h"

int A[5005];
int dif[5005];
// A[i] = dif(i, i+1);

void solve(int N) {
    int mx_dif = query(1,N);
    int l = 1, r = N;
    for(int i = 1; i < N; ++i) dif[i] = query(i,i+1);
    while(l < r) { // move l
        if(query(l+1,r) != mx) break;
        ++l;
    }
    while(l < r) { // move r
        if(query(l,r-1) != mx) break;
        --r;
    }

    A[l] = 1;
    A[r] = N;   
    // l , or r is the lowest
    int mx_dif = 0;
    for(int i = l-1; i >= 0; --i) {
        int dif = query(i,l);
        if(dif > mx_dif) {
            mx_dif = dif;
            A[i] = 1 + dif;
        }
        else {
            A[i] = A[i+1] - query(i,i+1);
        }
    }
    mx_dif = 0;
    for(int i = l+1; i < r; ++i) {
        int dif = query(l, i);
        if(dif > mx_dif) {
            mx_dif = dif;
            A[i] = 1 + dif;
        }
        else {
            A[i] = A[i-1] - query(i-1, i);
        }
    }
    
    mx_dif = 0;
    for(int i = r+1; i <= N; ++i) {
        int dif = query(l, i);
        if(dif > mx_dif) {
            mx_dif = dif;
            A[i] = 1 + dif;
        }
        else {
            A[i] = A[i-1] - query(i-1, i);
        }
    }

	for(int i = 1; i <= N; i++) {
		answer(i, A[i]);
	}

}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:12:28: error: 'mx' was not declared in this scope
   12 |         if(query(l+1,r) != mx) break;
      |                            ^~
xylophone.cpp:16:28: error: 'mx' was not declared in this scope
   16 |         if(query(l,r-1) != mx) break;
      |                            ^~
xylophone.cpp:23:9: error: redeclaration of 'int mx_dif'
   23 |     int mx_dif = 0;
      |         ^~~~~~
xylophone.cpp:8:9: note: 'int mx_dif' previously declared here
    8 |     int mx_dif = query(1,N);
      |         ^~~~~~