Submission #253567

#	Time	Username	Problem	Language	Result	Execution time	Memory
253567		Erkhemkhuu	Rectangles (IOI19_rect)	C++17	Compilation error	0 ms	0 KiB

rect

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define mp make_pair
#define F first
#define S second
const ll N = 5005;
bool valid(ll x1, ll y1, ll x2, ll y2, vector <vector <ll> > &a) {
    for(ll i = x1; i <= x2; i++) {
        for(ll j = y1; j <= y2; j++) {
            if(a[i][j] >= a[x1 - 1][j]) return false;
            if(a[i][j] >= a[x2 + 1][j]) return false;
            if(a[i][j] >= a[i][y1 - 1]) return false;
            if(a[i][j] >= a[i][y2 + 1]) return false;
        }
    }
    return true;
}
ll count_rectangles(vector <vector <int> > a) {
    ll res, i, j, n, m, i1, j1;
    res = 0;
    n = a.size(); m = a[0].size();
    for(i = 1; i < n - 1; i++)
        for(j = 1; j < m - 1; j++)
            for(i1 = i; i1 < n - 1; i1++)
                for(j1 = j; j1 < m - 1; j1++)
                    res += valid(i, j, i1, j1, a);
    return res;
}

Compilation message (stderr)

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:28:49: error: invalid initialization of reference of type 'std::vector<std::vector<long long int> >&' from expression of type 'std::vector<std::vector<int> >'
                     res += valid(i, j, i1, j1, a);
                                                 ^
rect.cpp:9:6: note: in passing argument 5 of 'bool valid(long long int, long long int, long long int, long long int, std::vector<std::vector<long long int> >&)'
 bool valid(ll x1, ll y1, ll x2, ll y2, vector <vector <ll> > &a) {
      ^~~~~