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답안 #1081451

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1081451 2024-08-30T05:05:44 Z kes0716 Archery (IOI09_archery) C++17
90 / 100
 492 ms 14512 KB 
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 200009;
int n, r, crit;
int a[2*MAXN];
struct State{
	int pl, ze, mi;
	State operator+(const State &s) const{
		return (State){pl+s.pl, ze+s.ze, mi+s.mi};
	}
} init[MAXN];
int simulate1(void){
	vector<State> pot(5*n);
	State pq = {0, 0, 0};
	int i, j;
	for(i=0; i<n; i++){
		pot[i] = init[i];
	}
	for(i=n; i<5*n; i++)
		pot[i] = {0, 0, 0};
	int cnt = 0, last = -1;
	int lwin = (init[0].pl ? 1 : (init[0].ze ? 0 : -1));
	for(i=0; i<4*n; i++){
		pq = pq + pot[i];
		int oppb;
		//printf("i=%d pq= +%d 0%d -%d\n", i, pq.pl, pq.ze, pq.mi);
		if(pq.pl >= 2){
			oppb = 1;
			pot[i+n].pl++;
			pq.pl--;
		}
		else if(pq.pl == 1){
			if(lwin == 1){
				if(pq.ze){
					oppb = 0;
					pot[i+n].ze++;
					pq.ze--;
				}
				else{
					oppb = -1;
					pot[i+n].mi++;
					pq.mi--;
				}
			}
			else{
				oppb = 1;
				pot[i+n].pl++;
				pq.pl--;
			}
		}
		else if(pq.ze && lwin){
			oppb = 0;
			pot[i+n].ze++;
			pq.ze--;
		}
		else{
			oppb = -1;
			pot[i+n].mi++;
			pq.mi--;
		}
		if(!lwin || !oppb)
			last = i;
		if(!oppb && lwin == 1)
			cnt++;
		else if(!lwin && oppb == 1)
			cnt++;
		lwin = max(lwin, oppb);
	}
	//printf("last=%d cnt=%d\n", last, cnt);
	int ret = last - r - n*cnt;
	return ret;
}
int simulate2(int pos){
	State pq = {0, 0, 0};
	int i, ans = pos;
	for(i=2*n; i>=1; i--){
		int cur = i%n;
		pq = pq + init[cur];
		//printf("i=%d pq.pl=%d ze=%d mi=%d\n", i,pq.pl, pq.ze, pq.mi);
		init[cur].pl = init[cur].mi = init[cur].ze = 0;
		if(cur){
			if(pq.mi){
				if(pq.ze)
					ans--;
				init[cur].mi = 1;
				pq.mi--;
			}
			else if(pq.ze){
				init[cur].ze = 1;
				pq.ze--;
			}
		}
		else{
			if(pq.ze)
				ans--;
		}
	}
	return ans;
}
int simulate(int p){
	int i, j=0;
	for(i=0; i<n; i++){
		init[i].pl = init[i].ze = init[i].mi = 0;
		if(p == i)
			init[i].ze++;
		else{
			if(a[j] < crit)
				init[i].pl++;
			else
				init[i].mi++;
			j++;
		}
		if(a[j] < crit)
			init[i].pl++;
		else
			init[i].mi++;
		j++;
	}
	if(crit <= n+1)
		return simulate1();
	return simulate2(p);
}
int main(){
	int i;
	scanf("%d %d", &n, &r);
	r = 2*n + r%n;
	scanf("%d", &crit);
	for(i=0; i<2*n-1; i++){
		scanf("%d", &a[i]);
	}
	if(crit==1){
		printf("%d\n", n);
		return 0;
	}
	pair<int, int> ans = make_pair(n, -1);	//(result, -start)
	for(int t=-4; t<=1; t++){
		int goal = t*n, lo = 0, hi = n-1, mid;
		while(lo < hi){
			mid = (lo+hi)/2;
			if(simulate(mid) >= goal)
				hi = mid;
			else
				lo = mid+1;
		}
		int crit = simulate(lo);
		//printf("lo=%d crit=%d\n", lo, crit);
		hi = n-1;
		while(lo < hi){
			mid = (lo+hi+1)/2;
			if(simulate(mid) == crit)
				lo = mid;
			else
				hi = mid-1;
		}
		//printf("lo=%d\n", lo);
		ans = min(ans, make_pair((crit%n + n)%n, -lo-1));
	}
	printf("%d\n", -ans.second);
	return 0;
}

Compilation message

archery.cpp: In function 'int simulate1()':
archery.cpp:15:9: warning: unused variable 'j' [-Wunused-variable]
   15 |  int i, j;
      |         ^
archery.cpp: In function 'int main()':
archery.cpp:125:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  125 |  scanf("%d %d", &n, &r);
      |  ~~~~~^~~~~~~~~~~~~~~~~
archery.cpp:127:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  127 |  scanf("%d", &crit);
      |  ~~~~~^~~~~~~~~~~~~
archery.cpp:129:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  129 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 3 ms 604 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct

Subtask #2
84.0 / 94.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 2 ms 348 KB Output is correct
4 Correct 31 ms 1648 KB Output is correct
5 Correct 492 ms 13976 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Incorrect 1 ms 348 KB Output isn't correct
8 Incorrect 27 ms 1628 KB Output isn't correct
9 Correct 49 ms 3988 KB Output is correct
10 Incorrect 2 ms 344 KB Output isn't correct
11 Correct 40 ms 3956 KB Output is correct
12 Correct 4 ms 604 KB Output is correct
13 Correct 219 ms 10804 KB Output is correct
14 Correct 7 ms 820 KB Output is correct
15 Correct 67 ms 4800 KB Output is correct
16 Incorrect 1 ms 348 KB Output isn't correct
17 Correct 2 ms 348 KB Output is correct
18 Correct 3 ms 604 KB Output is correct
19 Correct 5 ms 652 KB Output is correct
20 Correct 8 ms 852 KB Output is correct
21 Incorrect 36 ms 3968 KB Output isn't correct
22 Correct 46 ms 4700 KB Output is correct
23 Correct 339 ms 14512 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 6 ms 348 KB Output is correct
27 Correct 41 ms 2844 KB Output is correct
28 Correct 344 ms 3420 KB Output is correct
29 Correct 1 ms 344 KB Output is correct
30 Correct 5 ms 348 KB Output is correct
31 Correct 22 ms 2832 KB Output is correct
32 Correct 253 ms 4036 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 2 ms 348 KB Output is correct
36 Correct 4 ms 348 KB Output is correct
37 Correct 20 ms 2812 KB Output is correct
38 Correct 26 ms 2652 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 2 ms 348 KB Output is correct
42 Correct 2 ms 348 KB Output is correct
43 Correct 5 ms 348 KB Output is correct
44 Correct 10 ms 604 KB Output is correct
45 Correct 22 ms 2836 KB Output is correct
46 Correct 26 ms 2652 KB Output is correct
47 Correct 267 ms 4184 KB Output is correct