Submission #55411

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
55411	2018-07-07T08:26:22 Z	김세빈(#1545)	Toilets (JOI16_toilets)	C++11	36 / 100	78 ms	892 KB

toilets

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

char str[202020];
ll n, k, f, m;

bool check(ll k)
{
	ll i, a, b, s;
	
	a = b = 0;
	
	for(i=n+n-1;i>=0;i--){
		if(str[i] == 'M'){
			if(k) k --;
			else a ++;
		}
		else b ++;
		if((~(a+b) & 1) && a > b) return 0;
	}
	
	return 1;
}

int main()
{
	ll i, s, e;
	
	scanf("%lld%lld", &n, &k);
	
	if(k > 1) return 0;
	
	scanf("%s", str);
	
	for(i=0;i<n+n;i++){
		if(str[i] == 'F') f ++;
		else m ++;
	}
	
	if(f < m){
		printf("-1\n");
		return 0;
	}
	
	for(s=0,e=n+n;s<=e;){
		if(check(s+e>>1)) e = (s+e>>1) - 1;
		else s = (s+e>>1) + 1;
	}
	
	printf("%lld\n", e + 1);
	
	return 0;
}

Compilation message

toilets.cpp: In function 'bool check(ll)':
toilets.cpp:12:14: warning: unused variable 's' [-Wunused-variable]
  ll i, a, b, s;
              ^
toilets.cpp: In function 'int main()':
toilets.cpp:49:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   if(check(s+e>>1)) e = (s+e>>1) - 1;
            ~^~
toilets.cpp:49:27: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   if(check(s+e>>1)) e = (s+e>>1) - 1;
                          ~^~
toilets.cpp:50:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   else s = (s+e>>1) + 1;
             ~^~
toilets.cpp:32:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld", &n, &k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~
toilets.cpp:36:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", str);
  ~~~~~^~~~~~~~~~~

Subtask #1
14.0 / 14.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	3 ms	376 KB	Output is correct
3	Correct	3 ms	428 KB	Output is correct
4	Correct	3 ms	496 KB	Output is correct
5	Correct	2 ms	512 KB	Output is correct
6	Correct	3 ms	544 KB	Output is correct
7	Correct	3 ms	544 KB	Output is correct
8	Correct	2 ms	544 KB	Output is correct
9	Correct	2 ms	544 KB	Output is correct
10	Correct	4 ms	544 KB	Output is correct
11	Correct	2 ms	544 KB	Output is correct
12	Correct	3 ms	544 KB	Output is correct
13	Correct	3 ms	544 KB	Output is correct
14	Correct	2 ms	544 KB	Output is correct
15	Correct	2 ms	628 KB	Output is correct
16	Correct	2 ms	628 KB	Output is correct
17	Correct	2 ms	628 KB	Output is correct
18	Correct	2 ms	628 KB	Output is correct
19	Correct	2 ms	628 KB	Output is correct
20	Correct	2 ms	628 KB	Output is correct
21	Correct	2 ms	628 KB	Output is correct
22	Correct	2 ms	628 KB	Output is correct

Subtask #2
22.0 / 22.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	3 ms	376 KB	Output is correct
3	Correct	3 ms	428 KB	Output is correct
4	Correct	3 ms	496 KB	Output is correct
5	Correct	2 ms	512 KB	Output is correct
6	Correct	3 ms	544 KB	Output is correct
7	Correct	3 ms	544 KB	Output is correct
8	Correct	2 ms	544 KB	Output is correct
9	Correct	2 ms	544 KB	Output is correct
10	Correct	4 ms	544 KB	Output is correct
11	Correct	2 ms	544 KB	Output is correct
12	Correct	3 ms	544 KB	Output is correct
13	Correct	3 ms	544 KB	Output is correct
14	Correct	2 ms	544 KB	Output is correct
15	Correct	2 ms	628 KB	Output is correct
16	Correct	2 ms	628 KB	Output is correct
17	Correct	2 ms	628 KB	Output is correct
18	Correct	2 ms	628 KB	Output is correct
19	Correct	2 ms	628 KB	Output is correct
20	Correct	2 ms	628 KB	Output is correct
21	Correct	2 ms	628 KB	Output is correct
22	Correct	2 ms	628 KB	Output is correct
23	Correct	19 ms	764 KB	Output is correct
24	Correct	25 ms	764 KB	Output is correct
25	Correct	23 ms	764 KB	Output is correct
26	Correct	10 ms	764 KB	Output is correct
27	Correct	5 ms	764 KB	Output is correct
28	Correct	26 ms	764 KB	Output is correct
29	Correct	24 ms	776 KB	Output is correct
30	Correct	78 ms	776 KB	Output is correct
31	Correct	27 ms	776 KB	Output is correct
32	Correct	23 ms	776 KB	Output is correct
33	Correct	4 ms	776 KB	Output is correct
34	Correct	15 ms	776 KB	Output is correct
35	Correct	22 ms	776 KB	Output is correct
36	Correct	27 ms	776 KB	Output is correct
37	Correct	11 ms	776 KB	Output is correct
38	Correct	6 ms	776 KB	Output is correct
39	Correct	21 ms	776 KB	Output is correct
40	Correct	16 ms	892 KB	Output is correct

Subtask #3
0 / 64.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	3 ms	376 KB	Output is correct
3	Correct	3 ms	428 KB	Output is correct
4	Correct	3 ms	496 KB	Output is correct
5	Correct	2 ms	512 KB	Output is correct
6	Correct	3 ms	544 KB	Output is correct
7	Correct	3 ms	544 KB	Output is correct
8	Correct	2 ms	544 KB	Output is correct
9	Correct	2 ms	544 KB	Output is correct
10	Correct	4 ms	544 KB	Output is correct
11	Correct	2 ms	544 KB	Output is correct
12	Correct	3 ms	544 KB	Output is correct
13	Correct	3 ms	544 KB	Output is correct
14	Correct	2 ms	544 KB	Output is correct
15	Correct	2 ms	628 KB	Output is correct
16	Correct	2 ms	628 KB	Output is correct
17	Correct	2 ms	628 KB	Output is correct
18	Correct	2 ms	628 KB	Output is correct
19	Correct	2 ms	628 KB	Output is correct
20	Correct	2 ms	628 KB	Output is correct
21	Correct	2 ms	628 KB	Output is correct
22	Correct	2 ms	628 KB	Output is correct
23	Correct	19 ms	764 KB	Output is correct
24	Correct	25 ms	764 KB	Output is correct
25	Correct	23 ms	764 KB	Output is correct
26	Correct	10 ms	764 KB	Output is correct
27	Correct	5 ms	764 KB	Output is correct
28	Correct	26 ms	764 KB	Output is correct
29	Correct	24 ms	776 KB	Output is correct
30	Correct	78 ms	776 KB	Output is correct
31	Correct	27 ms	776 KB	Output is correct
32	Correct	23 ms	776 KB	Output is correct
33	Correct	4 ms	776 KB	Output is correct
34	Correct	15 ms	776 KB	Output is correct
35	Correct	22 ms	776 KB	Output is correct
36	Correct	27 ms	776 KB	Output is correct
37	Correct	11 ms	776 KB	Output is correct
38	Correct	6 ms	776 KB	Output is correct
39	Correct	21 ms	776 KB	Output is correct
40	Correct	16 ms	892 KB	Output is correct
41	Incorrect	2 ms	892 KB	Output isn't correct
42	Halted	0 ms	0 KB	-

Submission #55411

Compilation message

Subtask #1 14.0 / 14.0

Subtask #2 22.0 / 22.0

Subtask #3 0 / 64.0

Subtask #1
14.0 / 14.0

Subtask #2
22.0 / 22.0

Subtask #3
0 / 64.0