Submission #446495

#	Time	Username	Problem	Language	Result	Execution time	Memory
446495		dxz05	Paths (BOI18_paths)	C++14	70 / 100	1340 ms	21616 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];

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]]++;

        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);

    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:80:5: note: in expansion of macro 'debug'
   80 |     debug(ans);
      |     ^~~~~
paths.cpp:20:20: warning: statement has no effect [-Wunused-value]
   20 | #define debug(...) 42
      |                    ^~
paths.cpp:91:5: note: in expansion of macro 'debug'
   91 |     debug(ans);
      |     ^~~~~
paths.cpp:20:20: warning: statement has no effect [-Wunused-value]
   20 | #define debug(...) 42
      |                    ^~
paths.cpp:108:5: note: in expansion of macro 'debug'
  108 |     debug(ans);
      |     ^~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 27 / 27
• Subtask 4: 0 / 30