Submission #1081455

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1081455	2024-08-30T05:10:30 Z	kes0716	Archery (IOI09_archery)	C++17	84 / 100	341 ms	14628 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(i==r+n-1)
			break;
		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:127:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  127 |  scanf("%d %d", &n, &r);
      |  ~~~~~^~~~~~~~~~~~~~~~~
archery.cpp:129:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  129 |  scanf("%d", &crit);
      |  ~~~~~^~~~~~~~~~~~~
archery.cpp:131:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  131 |   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	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

78.0 / 94.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	0 ms	344 KB	Output isn't correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	2 ms	348 KB	Output is correct
4	Correct	23 ms	1648 KB	Output is correct
5	Correct	341 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	17 ms	1628 KB	Output isn't correct
9	Correct	27 ms	3984 KB	Output is correct
10	Incorrect	2 ms	344 KB	Output isn't correct
11	Incorrect	30 ms	4100 KB	Output isn't correct
12	Correct	3 ms	604 KB	Output is correct
13	Incorrect	150 ms	10880 KB	Output isn't correct
14	Correct	6 ms	820 KB	Output is correct
15	Correct	39 ms	4696 KB	Output is correct
16	Incorrect	1 ms	348 KB	Output isn't correct
17	Correct	1 ms	348 KB	Output is correct
18	Correct	2 ms	348 KB	Output is correct
19	Correct	3 ms	652 KB	Output is correct
20	Correct	6 ms	860 KB	Output is correct
21	Incorrect	24 ms	4108 KB	Output isn't correct
22	Correct	34 ms	4700 KB	Output is correct
23	Correct	246 ms	14628 KB	Output is correct
24	Correct	1 ms	344 KB	Output is correct
25	Correct	1 ms	348 KB	Output is correct
26	Correct	4 ms	344 KB	Output is correct
27	Correct	31 ms	2652 KB	Output is correct
28	Correct	256 ms	3420 KB	Output is correct
29	Correct	1 ms	348 KB	Output is correct
30	Correct	6 ms	348 KB	Output is correct
31	Correct	17 ms	2832 KB	Output is correct
32	Correct	192 ms	3836 KB	Output is correct
33	Correct	1 ms	344 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	14 ms	2648 KB	Output is correct
38	Correct	21 ms	2652 KB	Output is correct
39	Correct	1 ms	344 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	17 ms	2836 KB	Output is correct
46	Correct	18 ms	2652 KB	Output is correct
47	Correct	197 ms	4320 KB	Output is correct