Submission #525650

#	Time	Username	Problem	Language	Result	Execution time	Memory
525650		idas	Regions (IOI09_regions)	C++11	30 / 100	1000 ms	26152 KiB

regions

#include <bits/stdc++.h>
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define TSTS int ttt; cin >> ttt; while(ttt--) solve()
#define all(x) (x).begin(), (x).end()
#define le(vec) vec[vec.size()-1]
#define sz(x) ((int)((x).size()))
#define pb push_back
#define s second
#define f first

using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pdd;

const int INF=1e9, MOD=1e9+7, mod=998244353;
const ll LINF=1e18;

void setIO()
{
    FAST_IO;
}

void setIO(string s)
{
    FAST_IO;
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

const int N=2e5+10, R=510;
int n, r, q, up[R], gr[N], pre[R][R];
vi ad[N];

void dfs(int u)
{
    FOR(j, 1, r+1)
    {
        pre[j][gr[u]]+=up[j];
    }
    up[gr[u]]++;
    for(auto x : ad[u]){
        dfs(x);
    }
    up[gr[u]]--;
}

int main()
{
    setIO();
    cin >> n >> r >> q;
    cin >> gr[0];
    FOR(i, 1, n)
    {
        int s;
        cin >> s >> gr[i];
        ad[s-1].pb(i);
    }
    dfs(0);
    while(q--){
        int e1, e2;
        cin >> e1 >> e2;
        cout << pre[e1][e2] << endl;
    }
}

Compilation message (stderr)

regions.cpp: In function 'void setIO(std::string)':
regions.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 85