Submission #446561

#	Time	Username	Problem	Language	Result	Execution time	Memory
446561		dxz05	Paths (BOI18_paths)	C++14	100 / 100	1472 ms	32988 KiB

paths

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define revall(x) (x).rbegin(), (x).rend()

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.00001;
const int MOD = 1e9 + 7;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 3e5 + 3e2;
const int M = 222;

int cnt[N][10];
int color[N];
vector<int> g[N];

void solve(int TC) {
    int n, m, k;
    cin >> n >> m >> k;

    for (int i = 1; i <= n; i++){
        cin >> color[i];
    }

    vector<pair<int, int>> edges;

    ll ans = 0;
    for (int i = 1; i <= m; i++){
        int a, b;
        cin >> a >> b;

        ans += 2 * (color[a] != color[b]);

        cnt[a][color[b]]++;
        cnt[b][color[a]]++;

        g[a].push_back(b);
        g[b].push_back(a);

        edges.emplace_back(a, b);
    }

    if (k == 1){
        cout << 0;
        return;
    }

    if (k == 2){
        cout << ans;
        return;
    }

    debug(ans);

    for (int i = 1; i <= n; i++){
        for (int x = 1; x <= k; x++){
            for (int y = 1; y <= k; y++){
                set<int> s = {color[i], x, y};
                if (s.size() == 3) ans += 1ll * cnt[i][x] * cnt[i][y];
            }
        }
    }

    debug(ans);

    if (k == 3){
        cout << ans;
        return;
    }

    for (auto edge : edges){
        int i = edge.first, j = edge.second;
        for (int x = 1; x <= k; x++){
            for (int y = 1; y <= k; y++){
                set<int> s = {color[i], color[j], x, y};
                if (s.size() == 4) ans += 2ll * cnt[i][x] * cnt[j][y];
            }
        }
    }

    debug(ans);

    if (k == 4) {
        cout << ans;
        return;
    }

    for (int i = 1; i <= n; i++){
        vector<vector<int>> vv(6, vector<int>(6, 0));
        for (int j : g[i]){
            for (int x = 1; x <= 5; x++){
                vv[color[j]][x] += cnt[j][x];
            }
        }

        for (int a = 1; a <= 5; a++){
            if (a == color[i]) continue;
            for (int b = 1; b <= 5; b++){
                if (b == a || b == color[i]) continue;
                for (int c = 1; c <= 5; c++){
                    if (c == a || c == b || c == color[i]) continue;
                    for (int d = 1; d <= 5; d++){
                        if (d == a || d == b || d == c || d == color[i]) continue;
                        ans += 1ll * vv[a][b] * vv[c][d];
                    }
                }
            }
        }

    }

    debug(ans);

    cout << ans;

}

int main() {
    startTime = clock();
    cin.tie(nullptr); cout.tie(nullptr);
    ios_base::sync_with_stdio(false);

    bool llololcal = false;
#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    llololcal = true;
#endif

    int TC = 1;
    //cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

    if (llololcal) cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;

    return 0;
}

Compilation message (stderr)

paths.cpp: In function 'void solve(int)':
paths.cpp:20:20: warning: statement has no effect [-Wunused-value]
   20 | #define debug(...) 42
      |                    ^~
paths.cpp:84:5: note: in expansion of macro 'debug'
   84 |     debug(ans);
      |     ^~~~~
paths.cpp:20:20: warning: statement has no effect [-Wunused-value]
   20 | #define debug(...) 42
      |                    ^~
paths.cpp:95:5: note: in expansion of macro 'debug'
   95 |     debug(ans);
      |     ^~~~~
paths.cpp:20:20: warning: statement has no effect [-Wunused-value]
   20 | #define debug(...) 42
      |                    ^~
paths.cpp:112:5: note: in expansion of macro 'debug'
  112 |     debug(ans);
      |     ^~~~~
paths.cpp:20:20: warning: statement has no effect [-Wunused-value]
   20 | #define debug(...) 42
      |                    ^~
paths.cpp:143:5: note: in expansion of macro 'debug'
  143 |     debug(ans);
      |     ^~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 27 / 27
• Subtask 4: 30 / 30