Submission #824916

#	Time	Username	Problem	Language	Result	Execution time	Memory
824916		kwongweng	Ancient Books (IOI17_books)	C++17	50 / 100	121 ms	20960 KiB

books

#include "books.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef long double ld;
typedef pair<ll, ll> pll;
#define FOR(i, a, b) for(int i = a; i < b; i++)
#define ROF(i, a, b) for(int i = a; i >= b; i--)
#define ms memset
#define pb push_back
#define fi first
#define se second

ll minimum_walk(vi p, int s) {
	int n=p.size();
	vi used(n);
	vii r; ll ans=0;
	FOR(i,0,n){
		if (used[i] || p[i]==i) continue;
		int cur=i; int mx=0;
		while (p[cur] != i){
			ans += abs(p[cur]-cur);
			mx=max(mx,cur); used[cur]=1; cur=p[cur];
		}
		ans += abs(i-cur); mx=max(mx,cur); used[cur]=1;
		r.pb({i,mx});
	}
	int mx=0;
	FOR(i,0,r.size()){
		if (r[i].fi >= mx) ans += 2*(r[i].fi-mx);
		mx=max(mx,r[i].se);
	}

	return ans;
}

Compilation message (stderr)

books.cpp: In function 'll minimum_walk(vi, int)':
books.cpp:10:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 | #define FOR(i, a, b) for(int i = a; i < b; i++)
......
   32 |  FOR(i,0,r.size()){
      |      ~~~~~~~~~~~~                      
books.cpp:32:2: note: in expansion of macro 'FOR'
   32 |  FOR(i,0,r.size()){
      |  ^~~

• Subtask 1: 12 / 12
• Subtask 2: 10 / 10
• Subtask 3: 28 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30