Submission #19797

#	Time	Username	Problem	Language	Result	Execution time	Memory
19797		rhdmstjr	괄호 (kriii4_R)	C++98	0 / 100	4 ms	8896 KiB

R

#include <cstdio>

#define MAX_NUM 1000004
#define XXX     1000000007

long long dp[MAX_NUM];

int main(){
    int N, K; scanf("%d%d", &N, &K);
    // init
    dp[0] = 1; // for duplicated one
    dp[1] = K;
    
    for(int i = 2; i <= N; i++){
        long long &now = dp[i];
        long long &pre = dp[i - 1];
        
        now = 0;
        // odd
        if(i & 1){

        }else{
            now += dp[i / 2];
        }
        now %= XXX;
        
        now += pre * K * 2;
        //// subtract overlaped part
        long long dup = dp[i - 2] * K * K;
        dup %= XXX;
        
        now += (XXX - dup);
        now %= XXX;
    }
    
    printf("%lld\n", dp[N]);
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 92