제출 #1033855

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1033855		shjeong	동굴 (IOI13_cave)	C++17	0 / 100	87 ms	600 KiB

cave

#include <bits/stdc++.h>
#include "cave.h"
using namespace std;
typedef long long ll;
void exploreCave(int N) {
    int *s = (int*)malloc(N*sizeof(int));
    int *ans = (int*)malloc(N*sizeof(int));   //s[i] = j : i번 문은 j번 스위치 / ans[i] = j : i번 스위치는 j
    vector<bool> vis(N);
    for(int i = 0 ; i < N ; i++){
        int *tmp = (int*)malloc(N*sizeof(int));
        memset(tmp,0,sizeof(tmp));
        vector<ll> idx;
        for(int j = 0 ; j < N ; j++){
            if(!vis[j])idx.push_back(j);
        }
        for(int j = 0 ; j < i ; j++)tmp[s[j]] = ans[s[j]];
        ll x = tryCombination(tmp);
        bool f = (x==i);
        ll l = 0, r = (int)idx.size()-1;
        while(l < r){
            ll mid = l+r>>1;
            for(int i = l ; i <= mid ; i++)tmp[idx[i]] = 0;
            for(int i = mid+1 ; i <= r ; i++)tmp[idx[i]] = 1;
            ll x = tryCombination(tmp);
            if((x==i) == f){
                if(f==0)r = mid;
                else l = mid+1;
            }
            else{
                if(f==0)l = mid+1;
                else r = mid;
            }
        }
        ans[idx[r]] = f;
        s[i] = idx[r];
        vis[idx[r]] = 1;
        free(tmp);
    }
    answer(ans,s);
    free(ans); free(s);
}

컴파일 시 표준 에러 (stderr) 메시지

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:11:22: warning: argument to 'sizeof' in 'void* memset(void*, int, size_t)' call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess]
   11 |         memset(tmp,0,sizeof(tmp));
      |                      ^~~~~~~~~~~
cave.cpp:21:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   21 |             ll mid = l+r>>1;
      |                      ~^~

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