Submission #485552

#	Time	Username	Problem	Language	Result	Execution time	Memory
485552		M_W	Linear Garden (IOI08_linear_garden)	C++14	100 / 100	19 ms	6168 KiB

linear_garden

#include <bits/stdc++.h>
using namespace std;
char s[1000001];
int ex[1000001];
int main(){
	int N, M, cur = 0, mx = 0, mn = 0, ans = 0;
	scanf("%d %d", &N, &M);
	scanf("%s", s + 1);
	ex[0] = 1;
	for(int i = 1; i <= N; i++) ex[i] = (ex[i - 1] * 2) % M;
	for(int i = 1; i <= N; i++){
		mn = min(mn, cur);
		mx = max(mx, cur);
		if(s[i] == 'L') cur++;
		
		if(s[i] == 'P'){
			cur++;
			if(cur - mn > 2){
				// Do Nothing
			}
			else if(max(cur, mx) - mn == 2){
				if(cur == (max(cur, mx) + mn) / 2) ans = (ans + ex[(N - i) / 2 + ((N - i) % 2)]) % M;
				else ans = (ans + ex[(N - i) / 2]) % M;
			}
			else{
				ans = (ans + ex[(N - i) / 2] + ex[(N - i) / 2 + ((N - i) % 2)] - 1) % M;
			}
			cur -= 2;
		}
	}
	printf("%d", (ans + 1) % M);
}

Compilation message (stderr)

linear_garden.cpp: In function 'int main()':
linear_garden.cpp:7:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |  scanf("%d %d", &N, &M);
      |  ~~~~~^~~~~~~~~~~~~~~~~
linear_garden.cpp:8:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |  scanf("%s", s + 1);
      |  ~~~~~^~~~~~~~~~~~~

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