Submission #1081449

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1081449	2024-08-30T05:02:15 Z	kes0716	Archery (IOI09_archery)	C++17	90 / 100	464 ms	12376 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(4*n);
	State pq = {0, 0, 0};
	int i, j;
	for(i=0; i<n; i++){
		pot[i] = init[i];
	}
	int cnt = 0, last = -1;
	int lwin = (init[0].pl ? 1 : (init[0].ze ? 0 : -1));
	for(i=0; i<=3*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;
					if(i < 2*n)
						pot[i+n].ze++;
					pq.ze--;
				}
				else{
					oppb = -1;
					if(i < 2*n)
						pot[i+n].mi++;
					pq.mi--;
				}
			}
			else{
				oppb = 1;
				pot[i+n].pl++;
				pq.pl--;
			}
		}
		else if(pq.ze && lwin){
			oppb = 0;
			if(i < 2*n)
				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:126:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  126 |  scanf("%d %d", &n, &r);
      |  ~~~~~^~~~~~~~~~~~~~~~~
archery.cpp:128:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  128 |  scanf("%d", &crit);
      |  ~~~~~^~~~~~~~~~~~~
archery.cpp:130:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  130 |   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	600 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	344 KB	Output is correct
4	Correct	31 ms	1424 KB	Output is correct
5	Correct	464 ms	11620 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	25 ms	1676 KB	Output isn't correct
9	Correct	39 ms	1672 KB	Output is correct
10	Incorrect	4 ms	348 KB	Output isn't correct
11	Correct	36 ms	1860 KB	Output is correct
12	Correct	4 ms	600 KB	Output is correct
13	Correct	185 ms	8588 KB	Output is correct
14	Correct	7 ms	620 KB	Output is correct
15	Correct	45 ms	2396 KB	Output is correct
16	Incorrect	0 ms	348 KB	Output isn't correct
17	Correct	2 ms	348 KB	Output is correct
18	Correct	2 ms	588 KB	Output is correct
19	Correct	4 ms	692 KB	Output is correct
20	Correct	6 ms	792 KB	Output is correct
21	Incorrect	31 ms	1656 KB	Output isn't correct
22	Correct	37 ms	2396 KB	Output is correct
23	Correct	280 ms	12376 KB	Output is correct
24	Correct	1 ms	348 KB	Output is correct
25	Correct	1 ms	472 KB	Output is correct
26	Correct	5 ms	344 KB	Output is correct
27	Correct	47 ms	788 KB	Output is correct
28	Correct	346 ms	2904 KB	Output is correct
29	Correct	2 ms	600 KB	Output is correct
30	Correct	8 ms	348 KB	Output is correct
31	Correct	22 ms	2652 KB	Output is correct
32	Correct	261 ms	4024 KB	Output is correct
33	Correct	1 ms	348 KB	Output is correct
34	Correct	1 ms	344 KB	Output is correct
35	Correct	3 ms	348 KB	Output is correct
36	Correct	4 ms	348 KB	Output is correct
37	Correct	18 ms	2652 KB	Output is correct
38	Correct	31 ms	2652 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	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	28 ms	2652 KB	Output is correct
47	Correct	254 ms	4132 KB	Output is correct