Submission #210836

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
210836	2020-03-18T19:22:37 Z	bash	Paths (BOI18_paths)	C++17	Compilation error	0 ms	0 KB

paths

/**
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*/
#include <cstring>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>
 
#define F first
#define S second
#define endl '\n'
#define deb(x) cout<<#x<<' '<<x<<endl;
#define pb push_back
 using namespace __gnu_pbds;
using namespace std;

typedef tree<
int,
null_type,
less<int>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;
/*
#ifdef IZI_KATKA
#define int __int64_t
#else
#define int __int64
#endif
*/
const long long MOD = 1e9 + 7;
const long long MAXN = 1e6 + 1;

typedef long long ll;

#define pii pair<int,int>
 
long long readInt() {
    bool minus1 = false;
    long long result = 0;
    char ch;
    ch = getchar();
    while (true) {
        if (ch == '-') break;
        if (ch >= '0' && ch <= '9') break;
        ch = getchar();
    }
    if (ch == '-') minus1 = true; else result = ch-'0';
    while (true) {
        ch = getchar();
        if (ch < '0' || ch > '9') break;
        result = result*10 + (ch - '0');
    }
    if (minus1)
        return -result;
    else
        return result;
}                
#define int ll
int a[MAXN];
int dp[MAXN][(1 << 5) + 3];
int n, m, k;                
vector<int> g[MAXN];

int solve(int v, int mask) {
	if (__builtin_popcount(mask) == k) {
		return 1;		
	}
	if (~dp[v][mask]) return dp[v][mask];
	int &ans  = dp[v][mask];
	ans = 0;
	if (__builtin_popcount(mask) > 1) {
		ans += solve(v, (1 << k) - 1);
	}
	for (int i : g[v]) {
		if ((mask >> a[i]) & 1) continue;
		ans += solve(i, mask | (1 << a[i]));
	}                                       
	return ans;
}

int main() {
	#ifdef IZI_KATKA
	assert(freopen("input", "r", stdin));
    assert(freopen("output", "w", stdout));
    #endif
    n = readInt(), m = readInt(), k = readInt();
    memset(dp, -1, sizeof(dp));
    for (int i = 1; i <= n; i++) {
    	a[i] = readInt() - 1;
    }
    for (int i = 1; i <= m; i++) {
		int u = readInt(), v = readInt();
		g[v].pb(u);
		g[u].pb(v);
    }
    int ans = 0;
    for (int i = 1; i <= n; i++) {
    	ans += solve(i, (1 << (a[i])));
    }
    cout << ans << endl;
	return 0;
}

Compilation message

paths.cpp:101:10: error: '::main' must return 'int'
 int main() {
          ^