제출 #1123794

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1123794		SoMotThanhXuan	Pilot (NOI19_pilot)	C++20	100 / 100	441 ms	39804 KiB

pilot

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define REP(i, a, b) for(int i = a; i >= b; --i)
#define mp make_pair
#define all(v) v.begin(), v.end()
#define uni(v) v.erase(unique(all(v)), v.end())
const int mod = 1e9 + 7;
inline bool maximize(int &u, int v){
    if(v > u){
        u = v;
        return true;
    }
    return false;
}
inline bool minimize(int &u, int v){
    if(v < u){
        u = v;
        return true;
    }
    return false;
}
inline bool maximizell(long long &u, long long v){
    if(v > u){
        u = v;
        return true;
    }
    return false;
}
inline bool minimizell(long long &u, long long v){
    if(v < u){
        u = v;
        return true;
    }
    return false;
}
inline int fastPow(int a, int n){
    if(n == 0) return 1;
    int t = fastPow(a, n >> 1);
    t = 1ll * t * t % mod;
    if(n & 1) t = 1ll * t * a % mod;
    return t;
}
inline void add(int &u, int v){
    u += v;
    if(u >= mod) u -= mod;
}
inline void sub(int &u, int v){
    u -= v;
    if(u < 0) u += mod;
}
const int maxN = 1e6 + 5;
int n, q;
int root[maxN], sz[maxN];
pair<int, int> h[maxN], y[maxN];
bool mark[maxN];
long long answer[maxN];
long long rem = 0;
int find_root(int v){
    return root[v] = root[v] == v ? v : find_root(root[v]);
}
bool union_set(int u, int v){
    u = find_root(u);
    v = find_root(v);
    if(u == v) return false;
    if(sz[u] > sz[v])swap(u, v);
    rem -= 1ll * sz[u] * (sz[u] + 1) / 2;
    rem -= 1ll * sz[v] * (sz[v] + 1) / 2;
    root[v] = u;
    sz[u] += sz[v];
    rem += 1ll * sz[u] * (sz[u] + 1) / 2;
    return true;
}

void process(){
    cin >> n >> q;
    FOR(i, 1, n){
        cin >> h[i].first;
        h[i].second = i;
        root[i] = i;
        sz[i] = 1;
    }
    sort(h + 1, h + 1 + n);
    FOR(i, 1, q){
        cin >> y[i].first;
        y[i].second = i;
    }
    sort(y + 1, y + 1 + q);
    int j = 1;
    FOR(i, 1, q){
        while(j <= n && h[j].first <= y[i].first){
            ++rem;
            mark[h[j].second] = true;
            if(h[j].second >= 2 && mark[h[j].second - 1])union_set(h[j].second, h[j].second - 1);
            if(h[j].second + 1 <= n && mark[h[j].second + 1])union_set(h[j].second, h[j].second + 1);
            ++j;
        }
        answer[y[i].second] = rem;
    }
    FOR(i, 1, q)cout << answer[i] << '\n';
}
#define NAME ""
int main(){
    if(fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
//    cin >> t;
    while(t--)
        process();
    cerr << '\n' << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << " s\n" ;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

pilot.cpp: In function 'int main()':
pilot.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
pilot.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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