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답안 #315756

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
315756 2020-10-23T21:17:47 Z fadi57 캥거루 (CEOI16_kangaroo) C++14
0 / 100
 173 ms 190716 KB 
#include <bits/stdc++.h>
using namespace std;
const int mx=2000;
const int mod=1000000007;
typedef long long ll;
int n,m;
int st,en;
//(i,x,state);
map<int,int>mp;
ll dp[mx][mx][3];
ll solve(int i,int x,int dir){
    if(i==en){
       if(x==n){
        return 1;}
        return 0;
    }
   ll &ret=dp[i][x][dir];
  if(ret!=-1){return ret;}
     ret=0;
    if(dir==0){
        for(int j=i+1;j<=n;j++){
            if(mp[j]){continue;}
            
            mp[j]=1;
            ret=(ret+solve(j,x+1,dir^1))%mod;
            mp[j]=0;
        }
        
    }else{
         for(int j=i-1;j>=1;j--){
            if(mp[j]){continue;}
            mp[j]=1;
            ret=(ret+solve(j,x+1,dir^1))%mod;
            mp[j]=0;
        }
    }return ret%mod;
    
}
int main() {
   
  cin>>n>>st>>en;
  for(int i=0;i<=mx;i++){
      for(int j=0;j<=mx;j++){
          dp[i][j][0]=dp[i][j][1]=-1;
      }
  }
  
  mp[st]=1;
  cout<<(solve(st,1,0)+solve(st,1,1))%mod;

 
}

Compilation message

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:44:34: warning: iteration 2000 invokes undefined behavior [-Waggressive-loop-optimizations]
   44 |           dp[i][j][0]=dp[i][j][1]=-1;
      |                       ~~~~~~~~~~~^~~
kangaroo.cpp:43:20: note: within this loop
   43 |       for(int j=0;j<=mx;j++){
      |                   ~^~~~

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 173 ms 190716 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 173 ms 190716 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 173 ms 190716 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 173 ms 190716 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -