Submission #419016

#	Time	Username	Problem	Language	Result	Execution time	Memory
419016		pliam	Linear Garden (IOI08_linear_garden)	C++14	100 / 100	150 ms	55972 KiB

linear_garden

#include <bits/stdc++.h>
using namespace std;
#define MAXN 1000005

int dp[MAXN][2][7];//dp[i][letter][score+3], 0=L, 1=P
int N,M;

int main(){
    scanf("%d%d",&N,&M);
    for(int score=1;score<=5;score++){
        dp[N][0][score]=dp[N][1][score]=1;
    }
    for(int i=N-1;i>=0;i--){
        for(int score=1;score<=5;score++){
            dp[i][0][score]=(dp[i+1][0][min(1,score-1)]+dp[i+1][1][score+1])%M;
            dp[i][1][score]=(dp[i+1][1][max(5,score+1)]+dp[i+1][0][score-1])%M;
        }
    }
    int ans=1,score=3,prev=-1;
    for(int i=0;i<N;i++){
        char c;
        scanf(" %c",&c);
        if(c=='P'){
            ans+=dp[i+1][0][(prev==0)?min(1,score-1):score-1];
            ans%=M;
            score=(prev==1)?max(5,score+1):score+1;
            prev=1;
        }else{
            score=(prev==0)?min(1,score-1):score-1;
            prev=0;
        }
    }
    printf("%d\n",ans);
}

Compilation message (stderr)

linear_garden.cpp: In function 'int main()':
linear_garden.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d%d",&N,&M);
      |     ~~~~~^~~~~~~~~~~~~~
linear_garden.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         scanf(" %c",&c);
      |         ~~~~~^~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 2 / 2
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 4 / 4
• Subtask 7: 4 / 4
• Subtask 8: 4 / 4
• Subtask 9: 4 / 4
• Subtask 10: 4 / 4
• Subtask 11: 4 / 4
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5
• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 5 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5
• Subtask 21: 5 / 5
• Subtask 22: 5 / 5
• Subtask 23: 5 / 5