Submission #641598

#	Time	Username	Problem	Language	Result	Execution time	Memory
641598		christinelynn	Zagrade (COI20_zagrade)	C++17	100 / 100	882 ms	1064 KiB

zagrade

#include <bits/stdc++.h>
#define bupol __builtin_popcount
#define ll long long
#define fi first
#define se second
#define pb push_back
#define pu push
using namespace std;
const ll MAXN = 4e5+10;
const ll MAXS = 4010;
const ll INF = 1e9;
const ll MOD = 998244353;
const ll LOG = 60;
typedef pair<ll,ll> pii;
typedef pair<pii,ll> ipii;

vector <int> v;
char ans[MAXN];

int que(int x, int y){
    cout << "? " << x << ' ' << y << endl;
    int te; cin >> te; return te;
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, q; cin >> n >> q;
    for(int i=1; i<=n; i++){
        if(v.empty()){
            v.pb(i);
            continue;
        }
        v.pb(i);
        int siz = v.size()-1;
        int te = que(v[siz-1], v[siz]);
        if(te==1){
            ans[v[siz-1]] = '('; ans[v[siz]] = ')';
            v.pop_back(); v.pop_back();
        }
    }
    for(int i=0; i<v.size()/2; i++) ans[v[i]] = ')';
    for(int i=v.size()/2; i<v.size(); i++) ans[v[i]] = '(';
    cout << "! ";
    for(int i=1; i<=n; i++) cout << ans[i];
        cout << endl;
}

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:41:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for(int i=0; i<v.size()/2; i++) ans[v[i]] = ')';
      |                  ~^~~~~~~~~~~
zagrade.cpp:42:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(int i=v.size()/2; i<v.size(); i++) ans[v[i]] = '(';
      |                           ~^~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 7 / 7
• Subtask 3: 57 / 57
• Subtask 4: 22 / 22