QOJ.ac

QOJ

ID	题目	提交者	结果	用时	内存	语言	文件大小	提交时间	测评时间
#117491	#6394. Turn on the Light	installb^#	AC ✓	3ms	3812kb	C++14	710b	2023-07-01 13:39:59	2023-07-01 13:40:00

Judging History

你现在查看的是最新测评结果

[2023-08-10 23:21:45]
System Update: QOJ starts to keep a history of the judgings of all the submissions.

[2023-07-01 13:40:00]
评测

测评结果：AC
用时：3ms
内存：3812kb

查看

[2023-07-01 13:39:59]
提交

answer

#include <bits/stdc++.h>
#define rep(i,l,r) for(int i=(l);i<=(r);++i)
#define per(i,r,l) for(int i=(r);i>=(l);--i)
using namespace std;
int n;
int ask(int x){
    int ans=0;
    printf("? %d\n",x);fflush(stdout);
    scanf("%d",&ans);
    return ans;
}
void report(int x){
    printf("! %d\n",x);fflush(stdout);
    exit(0);
}
int main(){
    scanf("%d",&n);
    int l=1,r=n,x=0;
    while(l<r){
        if(x==0){
            if(ask(l)) x=1,++l;
            else report(l);
        }
        int mid=(l+r)>>1;
        int cur=ask(mid);
        if(abs(x)==cur) report(mid);
        else if(abs(x-1)==cur) r=mid-1,--x;
        else l=mid+1,++x;
    }
    report(l);
    return 0;
}

源文件, 语言: C++14

詳細信息

Test #1:

score: 100

Accepted

time: 0ms

memory: 3628kb

input:

3
1
2

output:

? 1
? 2
! 3

result:

ok Correct position at 3

Test #2:

score: 0

Accepted

time: 0ms

memory: 3568kb

input:

output:

? 1
? 6
? 2
? 4
! 3

result:

ok Correct position at 3

Test #3:

score: 0

Accepted

time: 0ms

memory: 3572kb

input:

output:

? 1
? 5
? 7
? 8
! 8

result:

ok Correct position at 8

Test #4:

score: 0

Accepted

time: 1ms

memory: 3768kb

input:

output:

? 1
? 5
? 2
? 3
! 3

result:

ok Correct position at 3

Test #5:

score: 0

Accepted

time: 1ms

memory: 3656kb

input:

output:

? 1
? 4
? 6
! 7

result:

ok Correct position at 7

Test #6:

score: 0

Accepted

time: 1ms

memory: 3580kb

input:

output:

? 1
? 4
? 2
? 3
! 3

result:

ok Correct position at 3

Test #7:

score: 0

Accepted

time: 0ms

memory: 3516kb

input:

output:

? 1
? 3
? 4
! 5

result:

ok Correct position at 5

Test #8:

score: 0

Accepted

time: 1ms

memory: 3636kb

input:

4
1
1

output:

? 1
? 3
! 3

result:

ok Correct position at 3

Test #9:

score: 0

Accepted

time: 2ms

memory: 3768kb

input:

3
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #10:

score: 0

Accepted

time: 1ms

memory: 3652kb

input:

2
1
1

output:

? 1
? 2
! 2

result:

ok Correct position at 2

Test #11:

score: 0

Accepted

time: 1ms

memory: 3800kb

input:

output:

! 1

result:

ok Correct position at 1

Test #12:

score: 0

Accepted

time: 2ms

memory: 3764kb

input:

output:

result:

ok Correct position at 384265

Test #13:

score: 0

Accepted

time: 0ms

memory: 3568kb

input:

output:

result:

ok Correct position at 827147

Test #14:

score: 0

Accepted

time: 3ms

memory: 3576kb

input:

output:

result:

ok Correct position at 61484

Test #15:

score: 0

Accepted

time: 1ms

memory: 3580kb

input:

output:

result:

ok Correct position at 827145

Test #16:

score: 0

Accepted

time: 1ms

memory: 3580kb

input:

output:

result:

ok Correct position at 384263

Test #17:

score: 0

Accepted

time: 2ms

memory: 3812kb

input:

output:

result:

ok Correct position at 952143

Test #18:

score: 0

Accepted

time: 2ms

memory: 3620kb

input:

output:

result:

ok Correct position at 203112

Test #19:

score: 0

Accepted

time: 0ms

memory: 3760kb

input:

output:

result:

ok Correct position at 952141

Test #20:

score: 0

Accepted

time: 0ms

memory: 3632kb

input:

output:

result:

ok Correct position at 452140

Test #21:

score: 0

Accepted

time: 2ms

memory: 3796kb

input:

output:

result:

ok Correct position at 827140

Test #22:

score: 0

Accepted

time: 3ms

memory: 3576kb

input:

output:

result:

ok Correct position at 43

Test #23:

score: 0

Accepted

time: 0ms

memory: 3584kb

input:

output:

result:

ok Correct position at 51

Test #24:

score: 0

Accepted

time: 0ms

memory: 3808kb

input:

output:

result:

ok Correct position at 51

Test #25:

score: 0

Accepted

time: 3ms

memory: 3636kb

input:

output:

result:

ok Correct position at 51

Test #26:

score: 0

Accepted

time: 2ms

memory: 3556kb

input:

output:

result:

ok Correct position at 999781

Test #27:

score: 0

Accepted

time: 1ms

memory: 3652kb

input:

output:

result:

ok Correct position at 999980

Test #28:

score: 0

Accepted

time: 0ms

memory: 3808kb

input:

output:

result:

ok Correct position at 999979

Test #29:

score: 0

Accepted

time: 1ms

memory: 3656kb

input:

output:

result:

ok Correct position at 999978

Test #30:

score: 0

Accepted

time: 2ms

memory: 3564kb

input:

output:

result:

ok Correct position at 499947

Test #31:

score: 0

Accepted

time: 2ms

memory: 3512kb

input:

output:

result:

ok Correct position at 500070

Test #32:

score: 0

Accepted

time: 3ms

memory: 3764kb

input:

output:

result:

ok Correct position at 500076

Test #33:

score: 0

Accepted

time: 0ms

memory: 3576kb

input:

output:

result:

ok Correct position at 499965

Test #34:

score: 0

Accepted

time: 1ms

memory: 3576kb

input:

output:

result:

ok Correct position at 295853

Test #35:

score: 0

Accepted

time: 3ms

memory: 3792kb

input:

output:

result:

ok Correct position at 568314

Test #36:

score: 0

Accepted

time: 2ms

memory: 3796kb

input:

output:

result:

ok Correct position at 8414

Test #37:

score: 0

Accepted

time: 2ms

memory: 3624kb

input:

output:

result:

ok Correct position at 780225

Test #38:

score: 0

Accepted

time: 2ms

memory: 3652kb

input:

output:

result:

ok Correct position at 1000000

Test #39:

score: 0

Accepted

time: 2ms

memory: 3812kb

input:

output:

result:

ok Correct position at 999999

Test #40:

score: 0

Accepted

time: 2ms

memory: 3572kb

input:

output:

result:

ok Correct position at 999998

Test #41:

score: 0

Accepted

time: 2ms

memory: 3572kb

input:

output:

result:

ok Correct position at 999997

Test #42:

score: 0

Accepted

time: 0ms

memory: 3764kb

input:

output:

result:

ok Correct position at 1000000

Test #43:

score: 0

Accepted

time: 1ms

memory: 3792kb

input:

1000000
0

output:

? 1
! 1

result:

ok Correct position at 1