Submission #252826

#	Time	Username	Problem	Language	Result	Execution time	Memory
252826		verngutz	Question (Grader is different from the original contest) (CEOI14_question_grader)	C++17	Compilation error	0 ms	0 KiB

encoder

#include <bits/stdc++.h>
using namespace std;
const int N = 10;
int A(int x, int y) {
    int least_differing_bit;
    for(int i = 0; i < N; i++) {
        if((x & (1 << i)) ^ (y & (1 << i))) {
            least_differing_bit = i;
            break;
        }
    }
    int x0 = (x & (1 << least_differing_bit)) == 0;
    if(least_differing_bit < 8) {
        return least_differing_bit | (x0 << 3);
    } else {
        return (least_differing_bit << 1) | x0;
    }
}
bool B(int q, int h) {
    int x0, least_differing_bit;
    if(h < 16) {
        x0 = h >> 3;
        least_differing_bit = h & 0b111;
    } else {
        x0 = h & 1;
        least_differing_bit = h >> 1;
    }
    return ((q >> least_differing_bit) & 1) ^ x0;
}
void test() {
    ifstream in("input.txt");
    int N, T;
    in >> N >> T;
    while(T--) {
        int x, y, q;
        in >> x >> y >> q;
        cout << "query " << x << " " << y << " " << q << endl;
        int h = A(x, y);
        assert(h < 21);
        if(B(q, h)) {
            assert(q == x);
        } else {
            assert(q == y);
        }
        cout << "ok h = " << h << endl;
    }
}
int main() {
    // test();
    int mode, N, T;
    cin >> mode >> N >> T;
    while(T--) {
        if(mode == 1) {
            int x, y;
            cin >> x >> y;
            cout << A(x, y) << endl;
        } else {
            int q, h;
            cin >> q >> h;
            cout << (B(q, h) ? "yes" : "no") << endl;
        }
    }
    return 0;
}

decoder

Compilation message (stderr)

encoder.cpp: In function 'int A(int, int)':
encoder.cpp:16:37: warning: 'least_differing_bit' may be used uninitialized in this function [-Wmaybe-uninitialized]
         return (least_differing_bit << 1) | x0;
                ~~~~~~~~~~~~~~~~~~~~~^~~~~
encoder.cpp: In function 'void test()':
encoder.cpp:14:46: warning: 'least_differing_bit' may be used uninitialized in this function [-Wmaybe-uninitialized]
         return least_differing_bit | (x0 << 3);
                                              ^
encoder.cpp:5:9: note: 'least_differing_bit' was declared here
     int least_differing_bit;
         ^~~~~~~~~~~~~~~~~~~
encoder.cpp: In function 'int main()':
encoder.cpp:14:46: warning: 'least_differing_bit' may be used uninitialized in this function [-Wmaybe-uninitialized]
         return least_differing_bit | (x0 << 3);
                                              ^
encoder.cpp:5:9: note: 'least_differing_bit' was declared here
     int least_differing_bit;
         ^~~~~~~~~~~~~~~~~~~
/tmp/ccVw2Za6.o: In function `main':
grader_encode.c:(.text.startup+0x0): multiple definition of `main'
/tmp/ccaBW7O1.o:encoder.cpp:(.text.startup+0x0): first defined here
/tmp/ccVw2Za6.o: In function `main':
grader_encode.c:(.text.startup+0x10a): undefined reference to `encode(int, int, int)'
collect2: error: ld returned 1 exit status

/tmp/ccNIOuoW.o: In function `main':
grader_decode.c:(.text.startup+0x19f): undefined reference to `decode(int, int, int)'
collect2: error: ld returned 1 exit status