Submission #980393

#	Time	Username	Problem	Language	Result	Execution time	Memory
980393		janson0109	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#include <combo.h>
using namespace std;

string guess_sequence(int N) {
    string p = "";
    string pos;
    if(press("AB") >= 1) {
        if(press("A") == 1) {
            p += "A";
            pos = "BXY";
        } else {
            p += "B";
            pos = "AXY";
        }
    } else {
        if(press("X") == 1) {
            p += "X";
            pos = "ABY";
        } else {
            p += "Y";
            pos = "ABX";
        }
    }
    for(int i=1; i<N-1; i++) {
        string guess = p + pos[0] + pos[0] + p + pos[0] + pos[1] + p + pos[0] + pos[2] + p + pos[1];
        switch(press(guess)) {
            case i:
                p += pos[2];
                break;
            case i+1:
                p += pos[1];
                break;
            case i+2:
                p += pos[0];
                break;
        }
    }
    if(press(p + "A" + p + "B") >= 1) {
        if(press(p + "A") == 1) {
            p += "A";
        } else {
            p += "B";
        }
    } else {
        if(press(p + "X") == 1) {
            p += "X";
        } else {
            p += "Y";
        }
    }
    return p;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:28:18: error: the value of 'i' is not usable in a constant expression
   28 |             case i:
      |                  ^
combo.cpp:25:13: note: 'int i' is not const
   25 |     for(int i=1; i<N-1; i++) {
      |             ^
combo.cpp:28:18: error: the value of 'i' is not usable in a constant expression
   28 |             case i:
      |                  ^
combo.cpp:25:13: note: 'int i' is not const
   25 |     for(int i=1; i<N-1; i++) {
      |             ^
combo.cpp:31:20: error: the value of 'i' is not usable in a constant expression
   31 |             case i+1:
      |                    ^
combo.cpp:25:13: note: 'int i' is not const
   25 |     for(int i=1; i<N-1; i++) {
      |             ^
combo.cpp:31:18: error: the value of 'i' is not usable in a constant expression
   31 |             case i+1:
      |                  ^
combo.cpp:25:13: note: 'int i' is not const
   25 |     for(int i=1; i<N-1; i++) {
      |             ^
combo.cpp:34:20: error: the value of 'i' is not usable in a constant expression
   34 |             case i+2:
      |                    ^
combo.cpp:25:13: note: 'int i' is not const
   25 |     for(int i=1; i<N-1; i++) {
      |             ^
combo.cpp:34:18: error: the value of 'i' is not usable in a constant expression
   34 |             case i+2:
      |                  ^
combo.cpp:25:13: note: 'int i' is not const
   25 |     for(int i=1; i<N-1; i++) {
      |             ^