Submission #548448

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
548448	2022-04-13 12:43:29	MilosMilutinovic	Snake Escaping (JOI18_snake_escaping)	C++14	22 / 100	936 ms	19168 KiB

snake_escaping

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#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],qmask[Q],omask[Q],qv[Q];
char s[N],qs[25];
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]]];
 
 
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Compilation message (stderr)

snake_escaping.cpp: In function 'void calc()':
snake_escaping.cpp:18:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |   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:51:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   51 |   while(bits.size()<l)bits.pb(0);
      |         ~~~~~~~~~~~^~
snake_escaping.cpp: In function 'void BruteForce()':
snake_escaping.cpp:33:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |   scanf("%s",qs);
      |   ~~~~~^~~~~~~~~
snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  scanf("%i%i",&l,&q);
      |  ~~~~~^~~~~~~~~~~~~~
snake_escaping.cpp:41:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |  scanf("%s",s);
      |  ~~~~~^~~~~~~~
snake_escaping.cpp:56:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |   scanf("%s",qs);
      |   ~~~~~^~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 10 / 10
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25