Submission #410892

#	Time	Username	Problem	Language	Result	Execution time	Memory
410892		abdzag	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
#include<unordered_map>
//#include "combo.h"
#define rep(i,a,b) for(int i=int(a);i<int(b);i++)
#define rrep(i,a,b) for(int i=int(a);i>int(b);i--)
#define all(v) v.begin(),v.end()
#define trav(a,v) for(auto&a:v)
#define  sz(a) a.size()
typedef long double ld;
using namespace std;
static const long long inf = 1e15;
typedef long long ll;
typedef unsigned long long ull;

string hidden = "";
int press(string s) {
	string cur = hidden;
	rrep(i, hidden.size(), -1) {
		bool done = true;
		rep(z, 0, s.size()-cur.size()+1) {
			done = true;
			rep(j, 0, cur.size()) {
				if (s[z + j] != cur[j]) {
					done = false;
					break;
				}
			}
			if (done)break;
		}
		if (done)break;
		cur.pop_back();
	}
	return cur.size();
}
string guess_sequence(int N) {
	string p = "";
	string cringe = "";
	vector<string> v = { "A","X","Y","B" };
	rep(i, 0, 3) {
		if (press(v[i])) {
			cringe += v[i];
			v.erase(v.begin() + i);
			p += cringe;
			break;
		}
	}
	if (p == "") {
		cringe += v[i];
		v.erase(v.begin() + i);
		p += cringe;
		break;
	}
	ll cur = 1;
	if (N == 1)return p;
	rep(i, 0, N - 2) {
		string nxt = p;
		nxt += v[0];
		nxt += p + v[1] + v[0];
		nxt += p + v[1] + v[1];
		nxt += p + v[1] + v[2];
		int val = press(nxt);
		if (val == cur + 1) {
			p += v[0];
		}
		else if (val == cur + 2) {
			p += v[1];
		}
		else p += v[2];
		cur++;
	}
	rep(i, 0, 3) {
		string nxt = p + v[i];
		if (press(nxt) == N) {
			p += v[i];
			break;
		}
	}
	return p;
}
int main() {
	vector<string> v = { "A","B","X","Y" };
	rep(i, 0, 4) {
		vector<string> v2 = v;
		v2.erase(v2.begin() + i);
		do {
			hidden = v[i];

			rep(j, 0, 2) {
				if (hidden != guess_sequence(hidden.size())) {
					cout << hidden;
					break;
				}
				hidden += v2[j];
			}
		} while (next_permutation(all(v2)));
	}
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:48:15: error: 'i' was not declared in this scope
   48 |   cringe += v[i];
      |               ^
combo.cpp:51:3: error: break statement not within loop or switch
   51 |   break;
      |   ^~~~~