#include<bits/stdc++.h>
#include "xylophone.h"
#define int long long
using namespace std;
/*int query(int l, int r)
{
cout<<"? "<<l<<" "<<r<<endl;
int x; cin>>x;
return x;
}
void answer(int p, int v)
{
cout<<"! "<<p<<" "<<v<<endl;
}*/
void solve(int n)
{
vector<int> a(n+1), s(n+1);
a[2] = query(1, 2), s[2] = 0;
int last = a[2];
for(int i = 3; i <= n; i++){
int cur = query(i-1, i), sum = query(i-2, i);
a[i] = cur;
if(last + cur == sum) s[i] = s[i-1];
else s[i] = (s[i-1] ^ 1);
last = cur;
}
vector<int> cd(n+1);
for(int i = 1; i <= n; i++) cd[i] = cd[i-1] + a[i] * (-s[i] * 2 + 1);
int maxplace = 1, minplace = 1;
for(int i = 1; i <= n; i++){
if(cd[maxplace] < cd[i]) maxplace = i;
if(cd[minplace] > cd[i]) minplace = i;
}
if(maxplace < minplace){
for(int i = 1; i <= n; i++) s[i] ^= 1;
for(int i = 1; i <= n; i++) cd[i] = cd[i-1] + a[i] * (-s[i] * 2 + 1);
}
int minval = 1e18;
for(int i = 1; i <= n; i++) minval = min(minval, cd[i]);
for(int i = 1; i <= n; i++) cd[i] += -minval + 1;
for(int i = 1; i <= n; i++) answer(i, cd[i]);
}
/*signed main()
{
solve(5);
}*/
Compilation message
/usr/bin/ld: /tmp/ccdFKYEd.o: in function `main':
grader.cpp:(.text.startup+0x30): undefined reference to `solve(int)'
collect2: error: ld returned 1 exit status
