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Submission #548369

# Submission time Handle Problem Language Result Execution time Memory
548369 2022-04-13T07:22:04 Z MilosMilutinovic Snake Escaping (JOI18_snake_escaping) C++14
22 / 100
 570 ms 65536 KB 
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int N=(1<<20)+5;
const int M=1600050;
const int Q=1000050;
int l,n,q,lst[M],pw[20],ans[Q],dp[M],msk[N];
char s[N],qs[25];
vector<pair<int,int>> Qs[128];
vector<int> ids[128];
void calc(){
	pw[0]=1;
	for(int i=1;i<14;i++)pw[i]=pw[i-1]*3;
	for(int i=0;i<M;i++){
		vector<int> bits;
		int x=i;
		while(x>0)bits.push_back(x%3),x/=3;
		lst[i]=-1;
		for(int j=0;j<bits.size();j++)if(bits[j]==2)lst[i]=j;
	}
}
void BruteForce(){
	memset(dp,0,sizeof *dp);
	for(int i=0;i<n;i++){
		int sum=0,x=i,b=0;
		while(x>0)sum+=(x%2)*pw[b++],x/=2;
		dp[sum]+=(int)(s[i]-'0');
	}
	for(int i=0;i<M;i++)if(lst[i]!=-1){
		dp[i]+=dp[i-2*pw[lst[i]]];
		dp[i]+=dp[i-pw[lst[i]]];
	}
	while(q--){
		scanf("%s",qs);
		int sum=0;
		for(int i=0;i<l;i++)sum+=(qs[i]=='0'?0:(qs[i]=='1'?1:2))*pw[l-i-1];
		printf("%i\n",dp[sum]);
	}
}
int main(){
	scanf("%i%i",&l,&q);
	scanf("%s",s);
	n=(1<<l),calc();
	if(l<=13){
		BruteForce();
		return 0;
	}
	for(int i=0;i<n;i++){
		vector<int> bits;
		int x=i;
		while(x>0)bits.pb(x%2),x/=2;
		while(bits.size()<l)bits.pb(0);
		msk[i]=0;
		for(int j=7;j<l;j++)msk[i]+=bits[j]*pw[j-7];
	}
	for(int i=0;i<n;i++)ids[i&127].pb(i);
	for(int i=1;i<=q;i++){
		scanf("%s",qs);
		int v=0;
		for(int j=7;j<l;j++)v+=(qs[j]=='0'?0:(qs[j]=='1'?1:2))*pw[l-j-1];
		int mask=0;
		for(int b=0;b<7;b++)if(qs[b]!='0')mask+=(1<<b);
		for(int j=0;j<128;j++)if((mask&j)==j)Qs[j].pb({v,i});
	}
	for(int i=0;i<128;i++){
		for(int j=0;j<M;j++)dp[j]=0;
		for(int j:ids[i])dp[msk[j]]+=(int)(s[j]-'0');
		for(int j=0;j<M;j++)if(lst[j]!=-1){
			dp[j]+=dp[j-2*pw[lst[j]]];
			dp[j]+=dp[j-pw[lst[j]]];
		}
		for(auto qs:Qs[i])ans[qs.second]+=dp[qs.first];
	}
	for(int i=1;i<=q;i++)printf("%i\n",ans[i]);
	return 0;
}

Compilation message

snake_escaping.cpp: In function 'void calc()':
snake_escaping.cpp:19:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |   for(int j=0;j<bits.size();j++)if(bits[j]==2)lst[i]=j;
      |               ~^~~~~~~~~~~~
snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:52:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   52 |   while(bits.size()<l)bits.pb(0);
      |         ~~~~~~~~~~~^~
snake_escaping.cpp: In function 'void BruteForce()':
snake_escaping.cpp:34:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |   scanf("%s",qs);
      |   ~~~~~^~~~~~~~~
snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:41:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |  scanf("%i%i",&l,&q);
      |  ~~~~~^~~~~~~~~~~~~~
snake_escaping.cpp:42:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |  scanf("%s",s);
      |  ~~~~~^~~~~~~~
snake_escaping.cpp:58:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |   scanf("%s",qs);
      |   ~~~~~^~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 12736 KB Output is correct
2 Correct 266 ms 12740 KB Output is correct
3 Correct 280 ms 12748 KB Output is correct
4 Correct 263 ms 12800 KB Output is correct
5 Correct 264 ms 12792 KB Output is correct
6 Correct 279 ms 12888 KB Output is correct
7 Correct 268 ms 12920 KB Output is correct
8 Correct 277 ms 12872 KB Output is correct
9 Correct 281 ms 12828 KB Output is correct
10 Correct 271 ms 12928 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 12736 KB Output is correct
2 Correct 266 ms 12740 KB Output is correct
3 Correct 280 ms 12748 KB Output is correct
4 Correct 263 ms 12800 KB Output is correct
5 Correct 264 ms 12792 KB Output is correct
6 Correct 279 ms 12888 KB Output is correct
7 Correct 268 ms 12920 KB Output is correct
8 Correct 277 ms 12872 KB Output is correct
9 Correct 281 ms 12828 KB Output is correct
10 Correct 271 ms 12928 KB Output is correct
11 Correct 476 ms 20564 KB Output is correct
12 Correct 509 ms 20296 KB Output is correct
13 Correct 478 ms 19472 KB Output is correct
14 Correct 475 ms 19732 KB Output is correct
15 Correct 478 ms 20672 KB Output is correct
16 Correct 479 ms 19932 KB Output is correct
17 Correct 487 ms 19864 KB Output is correct
18 Correct 464 ms 21628 KB Output is correct
19 Correct 489 ms 18632 KB Output is correct
20 Correct 470 ms 20228 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 12736 KB Output is correct
2 Correct 266 ms 12740 KB Output is correct
3 Correct 280 ms 12748 KB Output is correct
4 Correct 263 ms 12800 KB Output is correct
5 Correct 264 ms 12792 KB Output is correct
6 Correct 279 ms 12888 KB Output is correct
7 Correct 268 ms 12920 KB Output is correct
8 Correct 277 ms 12872 KB Output is correct
9 Correct 281 ms 12828 KB Output is correct
10 Correct 271 ms 12928 KB Output is correct
11 Correct 476 ms 20564 KB Output is correct
12 Correct 509 ms 20296 KB Output is correct
13 Correct 478 ms 19472 KB Output is correct
14 Correct 475 ms 19732 KB Output is correct
15 Correct 478 ms 20672 KB Output is correct
16 Correct 479 ms 19932 KB Output is correct
17 Correct 487 ms 19864 KB Output is correct
18 Correct 464 ms 21628 KB Output is correct
19 Correct 489 ms 18632 KB Output is correct
20 Correct 470 ms 20228 KB Output is correct
21 Correct 468 ms 22256 KB Output is correct
22 Correct 526 ms 22356 KB Output is correct
23 Correct 531 ms 21468 KB Output is correct
24 Correct 537 ms 21204 KB Output is correct
25 Correct 495 ms 23360 KB Output is correct
26 Correct 519 ms 21952 KB Output is correct
27 Correct 538 ms 21924 KB Output is correct
28 Correct 476 ms 24520 KB Output is correct
29 Correct 501 ms 20320 KB Output is correct
30 Correct 500 ms 22540 KB Output is correct
31 Correct 512 ms 22308 KB Output is correct
32 Correct 508 ms 22428 KB Output is correct
33 Correct 490 ms 20920 KB Output is correct
34 Correct 538 ms 20864 KB Output is correct
35 Correct 533 ms 21240 KB Output is correct
36 Correct 474 ms 19920 KB Output is correct
37 Correct 504 ms 21744 KB Output is correct
38 Correct 508 ms 19808 KB Output is correct
39 Correct 528 ms 20828 KB Output is correct
40 Correct 524 ms 20792 KB Output is correct

Subtask #4
0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 12736 KB Output is correct
2 Correct 266 ms 12740 KB Output is correct
3 Correct 280 ms 12748 KB Output is correct
4 Correct 263 ms 12800 KB Output is correct
5 Correct 264 ms 12792 KB Output is correct
6 Correct 279 ms 12888 KB Output is correct
7 Correct 268 ms 12920 KB Output is correct
8 Correct 277 ms 12872 KB Output is correct
9 Correct 281 ms 12828 KB Output is correct
10 Correct 271 ms 12928 KB Output is correct
11 Runtime error 570 ms 65536 KB Execution killed with signal 9
12 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 12736 KB Output is correct
2 Correct 266 ms 12740 KB Output is correct
3 Correct 280 ms 12748 KB Output is correct
4 Correct 263 ms 12800 KB Output is correct
5 Correct 264 ms 12792 KB Output is correct
6 Correct 279 ms 12888 KB Output is correct
7 Correct 268 ms 12920 KB Output is correct
8 Correct 277 ms 12872 KB Output is correct
9 Correct 281 ms 12828 KB Output is correct
10 Correct 271 ms 12928 KB Output is correct
11 Correct 476 ms 20564 KB Output is correct
12 Correct 509 ms 20296 KB Output is correct
13 Correct 478 ms 19472 KB Output is correct
14 Correct 475 ms 19732 KB Output is correct
15 Correct 478 ms 20672 KB Output is correct
16 Correct 479 ms 19932 KB Output is correct
17 Correct 487 ms 19864 KB Output is correct
18 Correct 464 ms 21628 KB Output is correct
19 Correct 489 ms 18632 KB Output is correct
20 Correct 470 ms 20228 KB Output is correct
21 Correct 468 ms 22256 KB Output is correct
22 Correct 526 ms 22356 KB Output is correct
23 Correct 531 ms 21468 KB Output is correct
24 Correct 537 ms 21204 KB Output is correct
25 Correct 495 ms 23360 KB Output is correct
26 Correct 519 ms 21952 KB Output is correct
27 Correct 538 ms 21924 KB Output is correct
28 Correct 476 ms 24520 KB Output is correct
29 Correct 501 ms 20320 KB Output is correct
30 Correct 500 ms 22540 KB Output is correct
31 Correct 512 ms 22308 KB Output is correct
32 Correct 508 ms 22428 KB Output is correct
33 Correct 490 ms 20920 KB Output is correct
34 Correct 538 ms 20864 KB Output is correct
35 Correct 533 ms 21240 KB Output is correct
36 Correct 474 ms 19920 KB Output is correct
37 Correct 504 ms 21744 KB Output is correct
38 Correct 508 ms 19808 KB Output is correct
39 Correct 528 ms 20828 KB Output is correct
40 Correct 524 ms 20792 KB Output is correct
41 Runtime error 570 ms 65536 KB Execution killed with signal 9
42 Halted 0 ms 0 KB -