Submission #651388

#	Time	Username	Problem	Language	Result	Execution time	Memory
651388		Alan	Handcrafted Gift (IOI20_gift)	C++17	Compilation error	0 ms	0 KiB

gift

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

int construct(int n, int m, vector<int> a, vector<int> b, vector<int> x) {
    string s (n, 0);
	vector<int> d (n+1), ps (n+1);
	for (int i = 0; i < m; i++) if (x[i] == 1) {
		d[a[i]]++;
		d[b[i]+1]--;
	}
	bool b = true;
	for (int i = 0; i < n; i++) {
		if (!d[i]) b = !b;
		s[i] = b ? 'R' : 'B';
		ps[i] += s[i] == 'B';
		if (i) ps[i] += ps[i-1];
	}
	for (int i = 0; i < m; i++) if (x[i] == 2) {
		int diff = ps[b[i]] - (a[i] ? ps[a[i]] : 0);
		if (diff == 0 || diff == b[i]-a[i]+1) return 0;
	}
	craft(s);
    return 1;
}

Compilation message (stderr)

gift.cpp: In function 'int construct(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
gift.cpp:12:7: error: declaration of 'bool b' shadows a parameter
   12 |  bool b = true;
      |       ^
gift.cpp:5:56: note: 'std::vector<int> b' previously declared here
    5 | int construct(int n, int m, vector<int> a, vector<int> b, vector<int> x) {
      |                                            ~~~~~~~~~~~~^
gift.cpp:20:18: error: invalid types 'bool[int]' for array subscript
   20 |   int diff = ps[b[i]] - (a[i] ? ps[a[i]] : 0);
      |                  ^
gift.cpp:21:29: error: invalid types 'bool[int]' for array subscript
   21 |   if (diff == 0 || diff == b[i]-a[i]+1) return 0;
      |                             ^