Submission #603011

#	Time	Username	Problem	Language	Result	Execution time	Memory
603011		Joshc	Linear Garden (IOI08_linear_garden)	C++11	100 / 100	488 ms	2248 KiB

linear_garden

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

char c[1000005];
int n, m, dp[2][6][3][5][2];

int main() {
    scanf("%d%d", &n, &m);
    for (int i=1; i<=n; i++) scanf(" %c", &c[i]);
    int x = (n+1)&1;
    fill(&dp[(n+1)&1][0][0][0][0], &dp[(n+1)&1][5][0][0][0], 1);
    for (int pos=n; pos; pos--) {
        for (int l=0; l<=2; l++) {
            for (int r=2; r<=4; r++) {
                for (int b=l; b<=r; b++) {
                    for (int islower=0; islower<2; islower++) {
                        int& res = dp[pos&1][b][l][r][islower];
                        res = 0;
                        if (r-b <= 1) res = dp[(pos+1)&1][b-1][min(b-1, l)][r][islower || c[pos] == 'P'];
                        if (b-l <= 1 && (islower || c[pos] == 'P')) res = (res+dp[(pos+1)&1][b+1][l][max(b+1, r)][islower])%m;
                    }
                }
            }
        }
    }
    printf("%d\n", dp[1][2][2][2][0]);
}

Compilation message (stderr)

linear_garden.cpp: In function 'int main()':
linear_garden.cpp:10:9: warning: unused variable 'x' [-Wunused-variable]
   10 |     int x = (n+1)&1;
      |         ^
linear_garden.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
linear_garden.cpp:9:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     for (int i=1; i<=n; i++) scanf(" %c", &c[i]);
      |                              ~~~~~^~~~~~~~~~~~~~

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