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Submission #291271

# Submission time Handle Problem Language Result Execution time Memory
291271 2020-09-05T03:22:55 Z couplefire Aliens (IOI07_aliens) C++17
0 / 100
 1 ms 512 KB 
#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, x0, y0;
    cin >> x0 >> y0;
    int lr = x0, hr = n;
    while(lr<hr){
        int m = lr+(hr-lr+1)/2;
        int m1 = lr+(m-lr)/2, m2 = lr+(m-lr)/4;
        cout << "examine " << m << " " << y0 << endl;
        string s; cin >> s;
        if(s == "false"){
            hr = m-1;
            continue;
        }
        cout << "examine " << m1 << " " << y0 << endl;
        string s1; cin >> s1;
        if(s1 == "false"){
            hr = m-1;
            continue;
        }
        cout << "examine " << m2 << " " << y0 << endl;
        string s2; cin >> s2;
        if(s2 == "false"){
            hr = m-1;
            continue;
        }
        else{
            lr = m;
        }
    }
    int ll = 1, hl = x0;
    while(ll<hl){
        int m = hl-(hl-ll+1)/2;
        int m1 = hl-(hl-m)/2, m2 = hl-(hl-m)/4;
        cout << "examine " << m << " " << y0 << endl;
        string s; cin >> s;
        if(s == "false"){
            ll = m+1;
            continue;
        }
        cout << "examine " << m1 << " " << y0 << endl;
        string s1; cin >> s1;
        if(s1 == "false"){
            ll = m+1;
            continue;
        }
        cout << "examine " << m2 << " " << y0 << endl;
        string s2; cin >> s2;
        if(s2 == "false"){
            ll = m+1;
            continue;
        }
        else{
            hl = m;
        }
    }
    int lt = y0, ht = n;
    while(lt<ht){
        int m = lt+(ht-lt+1)/2;
        int m1 = lt+(m-lt)/2, m2 = lt+(m-lt)/4;
        cout << "examine " << x0 << " " << m << endl;
        string s; cin >> s;
        if(s == "false"){
            ht = m-1;
            continue;
        }
        cout << "examine " << x0 << " " << m1 << endl;
        string s1; cin >> s1;
        if(s1 == "false"){
            ht = m-1;
            continue;
        }
        cout << "examine " << x0 << " " << m2 << endl;
        string s2; cin >> s2;
        if(s2 == "false"){
            ht = m-1;
            continue;
        }
        else{
            lt = m;
        }
    }
    int lx = lr, rx = hl, ty = lt, by = ty-lx+rx;
    int m = lx-rx+1;
    int x1 = (lx+rx)/2, y1 = (ty+by)/2;
    long long largeleft = x1+2*m, largeright = x1-2*m, largetop = y1+2*m, largebottom = y1-2*m;
    while(largetop <= n){
        cout << "examine " << x1 << " " << largetop << endl;
        string s; cin >> s;
        if(s == "false"){
            break;
        }
        else largetop += 2*m;
    }
    while(largeleft <= n){
        cout << "examine " << largeleft << " " << y1 << endl;
        string s; cin >> s;
        if(s=="false") break;
        else largeleft += 2*m;
    }
    while(largeright >= 1){
        cout << "examine " << largeright << " " << y1 << endl;
        string s; cin >> s;
        if(s=="false") break;
        else largeright -= 2*m;
    }
    while(largebottom >= 1){
        cout << "examine " << x1 << " " << largebottom << endl;
        string s; cin >> s;
        if(s == "false") break;
        else largebottom -= 2*m;
    }
    cout << "solution " << (largeright+largeleft)/2 << " " << (largetop+largebottom)/2 << endl;
}

Compilation message

aliens.cpp: In function 'int main()':
aliens.cpp:91:23: warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized]
   91 |     while(largetop <= n){
      |                       ^

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 512 KB Incorrect
2 Halted 0 ms 0 KB -