Submission #1253612

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253612		arda	Xylophone (JOI18_xylophone)	C++20	Compilation error	0 ms	0 KiB

xylophone

#include "xylophone.h"

static int A[5000];
int N, q_max = 10000, cnt = 0;
int q(int l, int r){
	cnt++;
	if(cnt > q_max){
		cout << -1 << endl;
		return 0;
	}
	if(!(1 <= l && l <= r && r <= N){
		cout << "-1" << endl;
		return 0;
	}
	return query(l, r);
}
void solve(int n) {
	N = n;
    int l = 1, r = n;
    while(l != r){
        int m = (l + r) / 2;
        if(m == 1){
            break;
        }
        int res = query(1, m);
        if(res == n-1) r = m;
        else l = m+1;
    }
    int ans[n+1], ans2[n+1];
    for(int i = 0; i <= n; i++) ans2[i] = -1;
    ans[l] = 1;
    ans2[1] = 1;
    if(l != n) ans[l+1] = query(l, l+1) + 1, ans2[ans[l+1]] = 1;
    // cout << l << "  " << ans[l] << " " << ans[l+1]<<endl;
    for(int i = l+2; i <= n; i++){
        int hmmm = query(i-1,i);
        if(ans[i-1] + hmmm > n){
            ans[i] = ans[i-1] - hmmm;
            ans2[ans[i-1]-hmmm] = 1;
            continue;
        }
        if(ans[i-1] - hmmm < 2){
            ans[i] = ans[i-1] + hmmm;
            ans2[ans[i-1]+hmmm] = 1;
            continue;
        }  
        if(ans2[ans[i-1] + hmmm] != -1){
            ans[i] = ans[i-1] - hmmm;
            ans2[ans[i-1]-hmmm] = 1;
            continue;
        }
        if(ans2[ans[i-1] - hmmm] != -1){
            ans[i] = ans[i-1] + hmmm;
            ans2[ans[i-1]+hmmm] = 1;
            continue;
        }  
        int of = query(i-2, i);
        if(ans[i-2]<ans[i-1]){
            if(of == (ans[i-1]-ans[i-2] + hmmm)) ans[i] = ans[i-1] + hmmm, ans2[ans[i-1] + hmmm] = 1;
            else ans[i] = ans[i-1] - hmmm, ans2[ans[i-1] - hmmm] = 1;
        }
        else{
            if(of == (ans[i-2]-ans[i-1] + hmmm)) ans[i] = ans[i-1] - hmmm, ans2[ans[i-1] - hmmm] = 1;
            else ans[i] = ans[i-1] + hmmm, ans2[ans[i-1] + hmmm] = 1;
        }
    }
    if(l != 1) ans[l-1] = query(l-1, l) + 1, ans2[ans[l-1]] = l-1;
    for(int i = l-2; i > 0; i--){
        int hmmm = query(i,i+1);
        if(ans[i+1] + hmmm > n){
            ans[i] = ans[i+1] - hmmm;
            ans2[ans[i+1]-hmmm] = i;
            continue;
        }
        if(ans[i+1] - hmmm < 2){
            ans[i] = ans[i+1] + hmmm;
            ans2[ans[i+1]+hmmm] = i;
            continue;
        }  
        if(ans2[ans[i+1] + hmmm] != -1){
            ans[i] = ans[i+1] - hmmm;
            ans2[ans[i+1]-hmmm] = i;
            continue;
        }
        if(ans2[ans[i+1] - hmmm] != -1){
            ans[i] = ans[i+1] + hmmm;
            ans2[ans[i+1]+hmmm] = i;
            continue;
        }  
        int of = query(i, i+2);
        if(ans[i+2]<ans[i+1]){
            if(of == (ans[i+1]-ans[i+2] + hmmm)) ans[i] = ans[i+1] + hmmm, ans2[ans[i+1] + hmmm] = i;
            else ans[i] = ans[i+1] - hmmm, ans2[ans[i+1] - hmmm] = i;
        }
        else{
            if(of == (ans[i+2]-ans[i+1] + hmmm)) ans[i] = ans[i+1] - hmmm, ans2[ans[i+1] - hmmm] = i;
            else ans[i] = ans[i+1] + hmmm, ans2[ans[i+1] + hmmm] = i;
        }
    }

    for(int i = 1; i <= n; i++) answer(i, ans[i]);

}

Compilation message (stderr)

xylophone.cpp: In function 'int q(int, int)':
xylophone.cpp:8:17: error: 'cout' was not declared in this scope
    8 |                 cout << -1 << endl;
      |                 ^~~~
xylophone.cpp:8:31: error: 'endl' was not declared in this scope
    8 |                 cout << -1 << endl;
      |                               ^~~~
xylophone.cpp:11:41: error: expected ';' before '{' token
   11 |         if(!(1 <= l && l <= r && r <= N){
      |                                         ^
      |                                         ;
xylophone.cpp:15:9: error: expected primary-expression before 'return'
   15 |         return query(l, r);
      |         ^~~~~~
xylophone.cpp:14:10: error: expected ')' before 'return'
   14 |         }
      |          ^
      |          )
   15 |         return query(l, r);
      |         ~~~~~~
xylophone.cpp:11:11: note: to match this '('
   11 |         if(!(1 <= l && l <= r && r <= N){
      |           ^
xylophone.cpp:16:1: warning: control reaches end of non-void function [-Wreturn-type]
   16 | }
      | ^