結果
| 問題 |
No.2927 Reverse Polish Equation
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2024-10-12 16:31:49 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 280 ms / 2,000 ms |
| コード長 | 3,802 bytes |
| コンパイル時間 | 2,944 ms |
| コンパイル使用メモリ | 252,660 KB |
| 実行使用メモリ | 11,344 KB |
| 最終ジャッジ日時 | 2024-10-16 00:26:39 |
| 合計ジャッジ時間 | 8,204 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 43 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = (int)1e9 + 1001010;
const ll llINF = (long long)4e18 + 22000020;
const string endn = "\n";
template <class T> inline auto vector2(size_t i, size_t j, const T &init = T()) {
return vector(i, vector<T>(j, init));
}
const string ELM_SEP = " ", VEC_SEP = endn;
template <class T> istream &operator>>(istream &i, vector<T> &A) {
for(auto &I : A) { i >> I; }
return i;
}
template <class T> ostream &operator<<(ostream &o, const vector<T> &A) {
int i = A.size();
for(const auto &I : A) { o << I << (--i ? ELM_SEP : ""); }
return o;
}
template <class T> ostream &operator<<(ostream &o, const vector<vector<T>> &A) {
int i = A.size();
for(const auto &I : A) { o << I << (--i ? VEC_SEP : ""); }
return o;
}
template <class T> vector<T> &operator++(vector<T> &A, int) {
for(auto &I : A) { I++; }
return A;
}
template <class T> vector<T> &operator--(vector<T> &A, int) {
for(auto &I : A) { I--; }
return A;
}
template <class T, class U> bool chmax(T &a, const U &b) { return ((a < b) ? (a = b, true) : false); }
template <class T, class U> bool chmin(T &a, const U &b) { return ((a > b) ? (a = b, true) : false); }
ll floor(ll a, ll b) {
if(b < 0) a = -a, b = -b;
return (a >= 0) ? a / b : (a + 1) / b - 1;
}
ll ceil(ll a, ll b) {
if(b < 0) a = -a, b = -b;
return (a > 0) ? (a - 1) / b + 1 : a / b;
}
ll bit(unsigned long long val, unsigned long long digit) { return (val >> digit) & 1; }
#ifdef DEBUG
#include <cpp-dump/dump.hpp>
#define dump(...) cpp_dump(__VA_ARGS__)
namespace cp = cpp_dump;
struct InitCppDump {
InitCppDump() {
if(!isatty(fileno(stderr))) CPP_DUMP_SET_OPTION(es_style, cpp_dump::es_style_t::no_es);
CPP_DUMP_SET_OPTION(log_label_func, cp::log_label::line());
CPP_DUMP_SET_OPTION(max_iteration_count, 30);
}
} init_cpp_dump;
#else
#define dump(...)
#endif
// ==================== ここまでテンプレ ====================
template<class Judgement>
ll binary_search_ll(ll ok, ll ng, Judgement judge){
auto need_continue = [&]() -> bool {
if(ok > ng) return((__int128_t)ok - (__int128_t)ng > 1);
else return ((__int128_t)ng - (__int128_t)ok > 1);
};
while(need_continue()){
ll mid = ((__int128_t)ok + (__int128_t)ng) / 2;
if(judge(mid)) ok = mid;
else ng = mid;
}
return ok;
};
int main(int argc, char *argv[]){
ios::sync_with_stdio(false);
cin.tie(nullptr);
ll q, y; cin >> q >> y;
vector<string> s(q); cin >> s;
auto eval = [&](ll x_val) -> ll {
vector<ll> a;
auto parse_int = [&](string s) -> ll {
if(s == "X") return x_val;
else return stoll(s);
};
for(int i = 0; i < q; i++){
if(s[i] == "+"){
ll v1 = a.back(); a.pop_back();
ll v2 = a.back(); a.pop_back();
a.push_back(v1 + v2);
}
else if(s[i] == "max"){
ll v1 = a.back(); a.pop_back();
ll v2 = a.back(); a.pop_back();
a.push_back(max(v1, v2));
}
else if(s[i] == "min"){
ll v1 = a.back(); a.pop_back();
ll v2 = a.back(); a.pop_back();
a.push_back(min(v1, v2));
}
else{
a.push_back(parse_int(s[i]));
}
}
assert(a.size() == 1);
return a[0];
};
auto judge = [&](ll x_val) -> bool {
dump(x_val);
dump(eval(x_val));
return eval(x_val) >= y;
};
ll ans = binary_search_ll(1e14, -1, judge);
dump(ans);
if(eval(ans) == y) cout << ans << endn;
else cout << -1 << endn;
return 0;
}