Submission #519210

#	Time	Username	Problem	Language	Result	Execution time	Memory
519210		XII	Zoltan (COCI16_zoltan)	C++17	7 / 140	97 ms	7128 KiB

zoltan

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

#define fi first
#define se second
#define mp make_pair
#define eb emplace_back
#define ALL(x) (x).begin(), (x).end()

#define FOR(i, a, b) for(int i = (a); i < (b); ++i)
#define FORU(i, a, b) for(int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)

#define IOS cin.tie(0)->sync_with_stdio(false);
#define PROB "COCI16_zoltan"
void Fi(){
    if(fopen(PROB".inp", "r")){
        freopen(PROB".inp", "r", stdin);
        freopen(PROB".out", "w", stdout);
    }
}

const int N = 2e5 + 1;
const int MOD = 1e9 + 7;
int a[N], n;
vector<int> X;
using pi = pair<int, int>;
pi comb(const pi &a, const pi &b){
    return a.fi == b.fi ? mp(a.fi, (a.se + b.se) % MOD)
                        : (a.fi > b.fi) ? a : b;
}

pi bitU[N], bitD[N];

void updateU(int i, const pi &v){
    while(1 <= i){
        bitU[i] = comb(bitU[i], v);
        i -= i & -i;
    }
}
pi getU(int i){
    pi ans = {0, 0};
    while(i <= X.size()){
        ans = comb(ans, bitU[i]);
        i += i & -i;
    }
    return ans;
}

void updateD(int i, const pi &v){
    while(i <= X.size()){
        bitD[i] = comb(v, bitD[i]);
        i += i & -i;
    }
}
pi getD(int i){
    pi ans = {0, 0};
    while(1 <= i){
        ans = comb(bitD[i], ans);
        i -= i & -i;
    }
    return ans;
}

void update(int i, const pi &v){
    updateU(i, v);
    updateD(i, v);
}

int main(){
    IOS;
    Fi();
    cin >> n;
    X.eb(0);
    FORU(i, 1, n){
        cin >> a[i];
        X.eb(a[i]);
    }
    X.eb(1e9 + 1);
    sort(ALL(X));
    X.resize(unique(ALL(X)) - X.begin());
    update(1, {0, 1});
    update(X.size(), {0, 1});
    pi ans = {0, 0};

    FORU(i, 1, n){
        a[i] = lower_bound(ALL(X), a[i]) - X.begin() + 1;
        pi lef = getU(a[i] + 1); lef.fi += 1;
        pi rig = getD(a[i] - 1); rig.fi += 1;
        ans = comb(ans, comb(lef, rig));
        if(i == 1) lef.se -= 1;
        update(a[i], comb(lef, rig));
    }
    cout << ans.fi << " " << ans.se;
    return 0;
}

Compilation message (stderr)

zoltan.cpp: In function 'pi getU(int)':
zoltan.cpp:45:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     while(i <= X.size()){
      |           ~~^~~~~~~~~~~
zoltan.cpp: In function 'void updateD(int, const pi&)':
zoltan.cpp:53:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     while(i <= X.size()){
      |           ~~^~~~~~~~~~~
zoltan.cpp: In function 'void Fi()':
zoltan.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(PROB".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
zoltan.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen(PROB".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 140