제출 #133790

#제출 시각아이디문제언어결과실행 시간메모리
133790claudy크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++14
0 / 100
565 ms109676 KiB
//# pragma GCC optimize("Ofast,no-stack-protector") //# pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native") //# pragma GCC optimize("Ofast") //# pragma GCC optimization ("unroll-loops") # include "bits/stdc++.h" /* # include <ext/pb_ds/tree_policy.hpp> # include <ext/pb_ds/assoc_container.hpp> # include <ext/rope> */ std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}}; # define ll long long # define clock (clock() * 1000.0 / CLOCKS_PER_SEC) # define rc(s) return cout << s,0 # define rcg(s) cout << s;exit(0) # define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0); # define db(x) cerr << #x << " = " << x << '\n' # define pb push_back # define mp make_pair # define all(s) s.begin(),s.end() # define sz(x) (int)((x).size()) //# define int ll using namespace std; char val[1 << 20]; int p[1 << 20][20]; vector<int>vec; int curr,k; int dep[1 << 20]; int nxt[1 << 20][26]; void Init() { vec.pb(0); } void TypeLetter(char L) { if(!nxt[curr][L - 'a']) nxt[curr][L - 'a'] = ++k; dep[k] = dep[curr] + 1; val[k] = L; vec.pb(k); p[k][0] = curr; for(int i = 1;i <= 20;i++) { p[k][i] = p[p[k][i - 1]][i - 1]; } curr = k; } void UndoCommands(int U) { curr = vec[sz(vec) - U - 1]; vec.pb(curr); } char GetLetter(int P) { int y = dep[curr] - P - 1; int x = curr; for(int i = 0;i <= 20;i++) { if(y & (1 << i)) { x = p[curr][i]; } } return val[x]; }

컴파일 시 표준 에러 (stderr) 메시지

scrivener.cpp: In function 'void TypeLetter(char)':
scrivener.cpp:46:11: warning: iteration 19 invokes undefined behavior [-Waggressive-loop-optimizations]
   p[k][i] = p[p[k][i - 1]][i - 1];
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
scrivener.cpp:44:18: note: within this loop
  for(int i = 1;i <= 20;i++)
                ~~^~~~~
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