Submission #287018

#	Time	Username	Problem	Language	Result	Execution time	Memory
287018		crossing0ver	Password (RMI18_password)	C++17	0 / 100	455 ms	384 KiB

password

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define vi vector<int>
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
using namespace std;

int m;
string suf,pref;
int query(string str);
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
vector<char> D;
bool check(int x) {
/*	string P = pref + D[x];
	P += suf;
	if (P.size() <= n) {
		int z = query(P);
		if (z > cur ) 
			return 1;
	}
	return 0;*/
	return 0;
}
string guess(int n, int s) {
	string P;
//	vector<char> D;
	for (char i = 'a'; i < 'a' + s ; i++)
		D.pb(i);
	shuffle(all(D),rng);
	map<char,int> mp;
	for (int i = 0;i < s; i++) mp[D[i]] = i;
	char fs = 'a';
	for (; pref.size() + suf.size() < n; ) {
		int len = suf.size() + pref.size();
		char LAST = ((int)pref.size() ? pref.back() : 'a');
		int cur = len;
//		vector<char> D = T;
		for (int z = 1; z + pref.size() + suf.size() <= n;) {
			bool flag = 0;
			vector<char> Q;
		//	shuffle(D.begin(),D.end(),rng);
	/*	int lo = max((pref.size() ? mp[pref.back()] : 0),(suf.size() ? mp[suf[0]] : 0));
		int hi = s-1;
		while (lo < hi) {
			int mid = (lo + hi)/2;
			if (check(mid))
		}*/
		for (int  b= max((pref.size() ? mp[pref.back()] : 0),(suf.size() ? mp[suf[0]] : 0)); b < s; b++){
			
			char c = D[b];
	///	for (char c : D) {
			if (pref.size() + suf.size() + 1 == n) {
			P = pref + c;
			P += suf;
			int F = query(P);
			if (F > cur) {
				LAST = c;
				pref += c;
				cur = F;
				flag  = 1;
				break;
			}
		}else if (pref.size() + suf.size() + 2 <= n){
			P = pref + c;
			P += c;
			P += suf;
			int F = query(P);
			if (F > cur + 1) {
				LAST = c;
				pref += c;
				pref += c;
				cur = F;
				flag  = 1;
				break;
			}else if (F > cur) {
				LAST = c;
				pref += c;
				cur = F;
				flag  = 1;
				break;
			} 
		}
		//	else Q.pb(c);
		}
	//	for (char c :  Q) D.erase(find(all(D),c));
		if (flag == 0) break;
		}
		reverse(all(suf));
		if (pref.size())
		suf+=pref.back();
		reverse(all(suf));
		if (pref.size())
		pref.pop_back();
		if (pref.size() + suf.size() == n) {
			pref += suf;
			int Z = query(pref);
			return pref;
		}
	}
	pref += suf;
	int z = query(pref);
	return pref;
}
/*
main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

}*/

Compilation message (stderr)

password.cpp: In function 'std::string guess(int, int)':
password.cpp:36:34: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |  for (; pref.size() + suf.size() < n; ) {
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
password.cpp:41:48: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |   for (int z = 1; z + pref.size() + suf.size() <= n;) {
      |                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
password.cpp:55:37: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   55 |    if (pref.size() + suf.size() + 1 == n) {
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
password.cpp:66:42: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   66 |   }else if (pref.size() + suf.size() + 2 <= n){
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
password.cpp:97:32: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   97 |   if (pref.size() + suf.size() == n) {
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
password.cpp:99:8: warning: unused variable 'Z' [-Wunused-variable]
   99 |    int Z = query(pref);
      |        ^
password.cpp:38:8: warning: variable 'LAST' set but not used [-Wunused-but-set-variable]
   38 |   char LAST = ((int)pref.size() ? pref.back() : 'a');
      |        ^~~~
password.cpp:35:7: warning: unused variable 'fs' [-Wunused-variable]
   35 |  char fs = 'a';
      |       ^~
password.cpp:104:6: warning: unused variable 'z' [-Wunused-variable]
  104 |  int z = query(pref);
      |      ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20