Submission #106616

#	Time	Username	Problem	Language	Result	Execution time	Memory
106616		hamzqq9	Lamps (JOI19_lamps)	C++14	4 / 100	50 ms	27768 KiB

lamp

#include<bits/stdc++.h>
#define st first
#define nd second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define umax(x,y) x=max(x,y)
#define umin(x,y) x=min(x,y)
#define ll long long 
#define ii pair<int,int>
#define iii pair<ii,int>
#define iiii pair<ii,ii>
#define sz(x) ((int) x.size())
#define orta ((bas+son)/2)
#define all(x) x.begin(),x.end()
#define pw(x) (1<<(x))
#define inf 1000000009
#define MOD 1000000007
#define N 1000006
#define M 2500005
#define LOG 20
#define KOK 300
#define EPS 0.0000001
using namespace std;

int n;
char a[N],b[N];
int dp[N][6];

int main() {

	scanf("%d",&n);

	scanf("%s %s",a+1,b+1);

	for(int i=0;i<=n;i++) {

		for(int j=0;j<6;j++) dp[i][j]=inf;

	}

	dp[0][5]=0;

	for(int i=1;i<=n;i++) {

		if(b[i]=='0') {

			umin(dp[i][0],min(dp[i-1][0],dp[i-1][2]));
			umin(dp[i][0],min(dp[i-1][4],dp[i-1][5])+1);

			umin(dp[i][1],dp[i-1][1]);
			umin(dp[i][1],dp[i-1][3]+1);

		}
		else {

			umin(dp[i][2],dp[i-1][2]);
			umin(dp[i][2],dp[i-1][0]+1);

			umin(dp[i][3],min(dp[i-1][1],dp[i-1][3]));
			umin(dp[i][3],min(dp[i-1][4],dp[i-1][5])+1);

		}

		if(b[i]^a[i]) {

			for(int j=0;j<6;j++) umin(dp[i][4],dp[i-1][j]+(j!=4));

		}
		else {

			for(int j=0;j<6;j++) umin(dp[i][5],dp[i-1][j]);

		}

	}

	int ans=inf;

	for(int i=0;i<6;i++) umin(ans,dp[n][i]);

	printf("%d",ans);

}

Compilation message (stderr)

lamp.cpp: In function 'int main()':
lamp.cpp:33:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
lamp.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s %s",a+1,b+1);
  ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 4 / 4
• Subtask 4: 0 / 49