Submission #415527

#	Time	Username	Problem	Language	Result	Execution time	Memory
415527		Pro_ktmr	Cave (IOI13_cave)	C++17	100 / 100	407 ms	460 KiB

cave

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define rep(i, n) for(int (i)=0; (i)<(n); (i)++)
#define repi(i, a, b) for(int (i)=(a); (i)<(b); (i)++)

#include "cave.h"
// int tryCombination(int S[])
// void answer(int S[], D[])

namespace {
    int s[5000], S[5000], D[5000];
    void turn(int l, int r){
        repi(i, l, r){
            if(S[i] == -1) s[i] ^= 1;
        }
    }
}

void exploreCave(int N) {
    rep(i, N){
        S[i] = -1;
        s[i] = 0;
        D[i] = -1;
    }
    rep(i, N - 1){
        int res = tryCombination(s);
        if(res != i) turn(0, N);
        int l = 0, r = N;
        while(r - l > 1){
            int m = (l + r) / 2;
            turn(l, m);
            int res = tryCombination(s);
            if(res == i) l = m;
            else{
                turn(l, m);
                r = m;
            }
        }
        turn(l, r);
        S[l] = s[l];
        D[l] = i;
    }
    rep(i, N) if(D[i] == -1){
        int res = tryCombination(s);
        if(res == N - 1) S[i] = s[i] ^ 1;
        else S[i] = s[i];
        D[i] = N - 1;
        break;
    }
    answer(S, D);
}

Compilation message (stderr)

cave.cpp: In function 'void {anonymous}::turn(int, int)':
cave.cpp:5:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    5 | #define repi(i, a, b) for(int (i)=(a); (i)<(b); (i)++)
      |                               ^
cave.cpp:14:9: note: in expansion of macro 'repi'
   14 |         repi(i, l, r){
      |         ^~~~
cave.cpp: In function 'void exploreCave(int)':
cave.cpp:4:27: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    4 | #define rep(i, n) for(int (i)=0; (i)<(n); (i)++)
      |                           ^
cave.cpp:21:5: note: in expansion of macro 'rep'
   21 |     rep(i, N){
      |     ^~~
cave.cpp:4:27: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    4 | #define rep(i, n) for(int (i)=0; (i)<(n); (i)++)
      |                           ^
cave.cpp:26:5: note: in expansion of macro 'rep'
   26 |     rep(i, N - 1){
      |     ^~~
cave.cpp:4:27: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    4 | #define rep(i, n) for(int (i)=0; (i)<(n); (i)++)
      |                           ^
cave.cpp:44:5: note: in expansion of macro 'rep'
   44 |     rep(i, N) if(D[i] == -1){
      |     ^~~

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24