Submission #95667

#	Time	Username	Problem	Language	Result	Execution time	Memory
95667		shenxy	Mechanical Doll (IOI18_doll)	C++11	Compilation error	0 ms	0 KiB

doll

#include <algorithm>
#include "doll.h"
#include <vector>
using namespace std;
int num_bits_in(int N) {
	int ans = 0;
	while (N != 0) {
		ans += 1;
		N = N >> 1;
    }
	return ans;
}
void create_circuit(int M, vector<int> A) {
	if (M == 1) {
		int evilnum = A.size() - 1;
		vector<int> C(2);
		C[0] = 1;
		C[1] = -1;
		vector<int> X(num_bits_in(A.size() - 1), 1), Y(num_bits_in(A.size() - 1), 1);
		for (int i = 0; i < X.size() - 1; i++) {
			if (evilnum & (1 << i)) Y[i] = 0 - (i + 2);
			else X[i] = 0 - (i + 2);
        }
      	if (evilnum & (1 << (X.size() - 1))) Y[i] = 0;
      	else X[i] = 0;
		answer(C, X, Y);
		return;
    }
	int N = A.size();
	vector<int> exits(M + 1, 0);
	int ptr = 0;
	for (int i = 0; i < N; i++) {
		exits[ptr] = A[i];
		ptr = A[i];
	}
	answer(exits, {}, {});
}

Compilation message (stderr)

doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:20:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |   for (int i = 0; i < X.size() - 1; i++) {
      |                   ~~^~~~~~~~~~~~~~
doll.cpp:24:47: error: 'i' was not declared in this scope
   24 |        if (evilnum & (1 << (X.size() - 1))) Y[i] = 0;
      |                                               ^
doll.cpp:25:15: error: 'i' was not declared in this scope
   25 |        else X[i] = 0;
      |               ^