Submission #376138

#	Time	Username	Problem	Language	Result	Execution time	Memory
376138		daniel920712	Lamps (JOI19_lamps)	C++14	0 / 100	1103 ms	81644 KiB

lamp

#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace std;
char a[1000005];
char b[1000005];
bool have[1000005]={0};
int DP[1000005],N;
int F(int here)
{
    int i,tt;
    if(here==N) return 0;
    if(have[here]) return DP[here];
    have[here]=1;
    if(a[here]==b[here]) DP[here]=F(here+1);
    else DP[here]=F(here+1)+1;
    tt=0;
    for(i=here;i<N;i++)
    {
        if(b[i]=='1'&&(i==here||b[i-1]=='0')) tt++;
        DP[here]=min(DP[here],F(i+1)+tt+1);
    }
    tt=0;
    for(i=here;i<N;i++)
    {
        if(b[i]=='0'&&(i==here||b[i-1]=='1')) tt++;
        DP[here]=min(DP[here],F(i+1)+tt+1);
    }
    for(i=here;i<N;i++)
    {
        if(a[i]!=b[i]) DP[here]=min(DP[here],F(i+1)+1);
        else break;
    }
    return DP[here];

}
int main()
{
    int M,ans=0,i;
    scanf("%d",&N);
    scanf("%s %s",a,b);

    printf("%d\n",F(0));
    return 0;
}

Compilation message (stderr)

lamp.cpp: In function 'int main()':
lamp.cpp:40:9: warning: unused variable 'M' [-Wunused-variable]
   40 |     int M,ans=0,i;
      |         ^
lamp.cpp:40:11: warning: unused variable 'ans' [-Wunused-variable]
   40 |     int M,ans=0,i;
      |           ^~~
lamp.cpp:40:17: warning: unused variable 'i' [-Wunused-variable]
   40 |     int M,ans=0,i;
      |                 ^
lamp.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |     scanf("%d",&N);
      |     ~~~~~^~~~~~~~~
lamp.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |     scanf("%s %s",a,b);
      |     ~~~~~^~~~~~~~~~~~~

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