Submission #1107254

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107254		jadai007	Aliens (IOI07_aliens)	C++17	Compilation error	0 ms	0 KiB

aliens

#include<bits/stdc++.h>

using namespace std;

int n, xo, yo; 
string ck;

bool check(int x, int y){
    if(x < 1 || x > n || y < 1 || y > n) return false;
    cout << "examine " << x << ' ' << y << endl;
    cin >> ck;
    if(ck == "false") return false;
    return true;
}

int main(){
    cin >> n >> xo >> yo;
    int lx = xo, ly = yo, x, y;
    for(int j = 0; j < 3; ++j){
        for(int i = 31; i >= 0; --i){
            x = lx - (1<<i), y = ly;
            if(check(x, y)) lx = x, ly = y;
        }
    }
    for(int j = 0; j < 3; ++j){
        for(int i = 31; i >= 0; --i){
            x = lx, y = ly = y - (1<<i);
            if(check(x, y)) lx = x, ly = y;
        }
    }
    for(int i = 31; i >= 0; --i){
        x = lx - (1<<i), y = ly - (1<<i);
        if(check(x, y)) lx = x, ly = y;
    }
    int rx = lx;
    for(int i = 31; i >= 0; --i){
        int cx = rx + (1<<i);
        if(check(cx, ly)) rx = cx;
    }
    int sz = rx - lx + 1;
    int ry += (sz - 1);
    cout << "solution " << (lx + rx)/2 << ' ' << (ly + ry)/2;
}

Compilation message (stderr)

aliens.cpp: In function 'int main()':
aliens.cpp:41:12: error: expected initializer before '+=' token
   41 |     int ry += (sz - 1);
      |            ^~
aliens.cpp:42:56: error: 'ry' was not declared in this scope; did you mean 'rx'?
   42 |     cout << "solution " << (lx + rx)/2 << ' ' << (ly + ry)/2;
      |                                                        ^~
      |                                                        rx
aliens.cpp:40:9: warning: unused variable 'sz' [-Wunused-variable]
   40 |     int sz = rx - lx + 1;
      |         ^~