Submission #1081452

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1081452	2024-08-30T05:06:38 Z	kes0716	Archery (IOI09_archery)	C++17	90 / 100	336 ms	14620 KB

archery

#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=-3; t<=0; 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

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	2 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

#	Verdict	Execution time	Memory	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	23 ms	1628 KB	Output is correct
5	Correct	336 ms	13788 KB	Output is correct
6	Correct	1 ms	348 KB	Output is correct
7	Incorrect	1 ms	348 KB	Output isn't correct
8	Incorrect	19 ms	1628 KB	Output isn't correct
9	Correct	27 ms	3988 KB	Output is correct
10	Incorrect	1 ms	344 KB	Output isn't correct
11	Correct	38 ms	3952 KB	Output is correct
12	Correct	3 ms	604 KB	Output is correct
13	Correct	147 ms	10868 KB	Output is correct
14	Correct	8 ms	856 KB	Output is correct
15	Correct	36 ms	4804 KB	Output is correct
16	Incorrect	1 ms	444 KB	Output isn't correct
17	Correct	2 ms	344 KB	Output is correct
18	Correct	2 ms	604 KB	Output is correct
19	Correct	4 ms	652 KB	Output is correct
20	Correct	6 ms	820 KB	Output is correct
21	Incorrect	24 ms	3964 KB	Output isn't correct
22	Correct	32 ms	4472 KB	Output is correct
23	Correct	227 ms	14620 KB	Output is correct
24	Correct	1 ms	348 KB	Output is correct
25	Correct	1 ms	348 KB	Output is correct
26	Correct	4 ms	552 KB	Output is correct
27	Correct	31 ms	2652 KB	Output is correct
28	Correct	261 ms	2908 KB	Output is correct
29	Correct	1 ms	344 KB	Output is correct
30	Correct	4 ms	548 KB	Output is correct
31	Correct	17 ms	2836 KB	Output is correct
32	Correct	194 ms	3920 KB	Output is correct
33	Correct	0 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	2 ms	348 KB	Output is correct
37	Correct	13 ms	784 KB	Output is correct
38	Correct	20 ms	1112 KB	Output is correct
39	Correct	0 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	4 ms	348 KB	Output is correct
44	Correct	8 ms	604 KB	Output is correct
45	Correct	16 ms	2652 KB	Output is correct
46	Correct	18 ms	2652 KB	Output is correct
47	Correct	187 ms	4144 KB	Output is correct