#include <bits/stdc++.h>
//#include "xylophone.h"
using namespace std;
#define f first
#define s second
#define pb push_back
#define ar array
#define all(x) x.begin(), x.end()
#define siz(x) (int)x.size()
#define FOR(x, y, z) for(int x = (y); x < (z); x++)
#define ROF(x, z, y) for(int x = (y-1); x >= (z); x--)
#define F0R(x, z) FOR(x, 0, z)
#define R0F(x, z) ROF(x, 0, z)
#define trav(x, y) for(auto&x:y)
using ll = long long;
using vi = vector<int>;
using vl = vector<long long>;
using pii = pair<int, int>;
using vpii = vector<pair<int, int>>;
template<class T> inline bool ckmin(T&a, T b) {return b < a ? a = b, 1 : 0;}
template<class T> inline bool ckmax(T&a, T b) {return b > a ? a = b, 1 : 0;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const char nl = '\n';
const int mxN = 2e5 + 10;
const int MOD = 1e9 + 7;
const long long infLL = 1e18;
#ifdef ACMX
int query(int a, int b){
cout << a << " " << b << endl;
int res; cin >> res;
return res;
}
void answer(int i, int x){
cout << i << ' ' << x << endl;
}
#endif
void solve(int N){
vi a(N + 1);
a[1] = 0;
a[2] = query(1, 2);
FOR(i, 2, N){
int t = query(i, i+1);
int u = query(i-1, i+1);
if(t + a[i] - a[i-1] == u){
if(a[i] - a[i-1] >= 0) a[i+1] = a[i] + t;
else a[i+1] = a[i] - t;
}
else{
if(a[i] - a[i-1] >= 0) a[i+1] = a[i] - t;
else a[i+1] = a[i] + t;
}
}
int mn = *min_element(1+all(a));
FOR(i, 1, N+1) a[i] -= mn;
int l, r;
FOR(i, 1, N+1){
if(a[i] == 0) l = i;
if(a[i] == N-1) r = i;
}
FOR(i, 1, N+1){
if(l < r){
answer(i, a[i]+1);
}
else{
answer(i, N-a[i]);
}
}
}
#ifdef ACMX
int32_t main(){
ios_base::sync_with_stdio(0); cin.tie(0);
solve(5);
return 0;
}
#endif
Compilation message
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:46:12: error: 'query' was not declared in this scope
46 | a[2] = query(1, 2);
| ^~~~~
xylophone.cpp:68:13: error: 'answer' was not declared in this scope
68 | answer(i, a[i]+1);
| ^~~~~~
xylophone.cpp:71:13: error: 'answer' was not declared in this scope
71 | answer(i, N-a[i]);
| ^~~~~~
