Submission #1072989

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072989		phong	Naan (JOI19_naan)	C++17	100 / 100	2871 ms	148152 KiB

naan

#include<bits/stdc++.h>

#define ll long long
#define int long long
const int nmax = 2e3 + 5, N = 1e5;
const ll oo = 1e12 + 1, base = 311;
const int lg = 19, M = 10;
const ll mod = 998244353, mod2 = 1e9 + 5277;
#define pii pair<int, int>
#define fi first
#define se second
#define endl "\n"
#define debug(a, n) for(int i = 1; i <= n; ++i) cout << a[i] << ' '; cout << "\n";
using namespace std;

int n, L;
int a[nmax][nmax];
ll s[nmax][nmax];
struct node{
    int x, y, id;
};
ll sum[nmax];
bool vis[nmax];
pii apply(pii tx){
    if(tx.se == 0) return tx;
    int lc = __gcd(tx.fi, tx.se);
    return {tx.fi / lc, tx.se / lc};
}

bool check(pii t1, pii t2){
    t1 = apply(t1);
    t2 = apply(t2);
    if(t1.fi == 0) return 1;
    if(t2.fi == 0) return 0;

   if(t1.fi / t1.se != t2.fi / t2.se) return t1.fi / t1.se < t2.fi / t2.se;
    return (t1.fi % t1.se) * t2.se <= (t2.fi%t2.se) * t1.se;
}
ll calc(int l, int r, int i){
    if(l > r) return 0;
    return s[i][r]  - s[i][l - 1];
}
pii get(pii t1, pii t2, int idx){
    if(t1.fi == 0) return t2;
    if(t2.fi == 0) return t1;
    pii tx ={t1.fi * t2.se + (t1.se * t2.fi * idx), t1.se * t2.se};
    tx = apply(tx);
    return tx;
}
pii c[nmax][nmax];
bool okla(pii t1, pii t2){
    t1 = apply(t1);
    t2 = apply(t2);
    return t1 == t2;
}
main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
//    freopen("code.inp", "r", stdin);
//    freopen("code.out", "w", stdout);
    cin >> n >> L;
    for(int i = 1; i <= n; ++i){
        for(int j = 1; j <= L; ++j){
            cin >> a[i][j];
            sum[i] += a[i][j];
            s[i][j] = s[i][j - 1] + a[i][j];
            c[i][j] = {-1, -1};
        }
    }
    pii pos = {0, 0};
    vector<int> tmp;
    int last = 0;
    for(int i = 1; i <= n; ++i){
        last = 0;
        for(int j = 1; j <= n; ++j){
            int l =0, r = L, t1 = -1,t2 = -1;
            l = 0, r = L + 1;
            pii dx;
            while(l <= r){
                int mid = r + l >> 1;
                pii tx = {0, 0};
                tx = get(tx, {calc(1, mid, i), 1}, 1);
                if(check(tx, {sum[i] * j, n})){
                    l = mid + 1;
                    t2 = mid;
                    dx = tx;
                }
                else r = mid - 1;
            }
            if(t2 == -1) break;
            pii one = get({sum[i] * j, n}, dx, -1);
            if(a[i][t2 + 1]) one.se *= a[i][t2 + 1];
            pii tx = one;
            tx = get(tx, {t2, 1}, 1);
            c[i][j] = pos = tx;
        }
    }
     pos = {0, 0};
    for(int j = 1; j <= n; ++j){
        int idx = -1;
        pii ma;
        for(int i = 1; i <= n; ++i){
            if(vis[i] || c[i][j].fi ==-1) continue;
            if(idx == -1 || check(c[i][j], ma) && check(pos, c[i][j]) && !okla(pos, c[i][j])){
                ma = c[i][j];
                idx = i;
            }
        }
        if(idx == -1) cout << -1, exit(0);
        vis[idx] = 1;
        if(j < n) cout << ma.fi << ' ' << ma.se << endl;
        pos = ma;
        tmp.push_back(idx);
    }

    for(auto p : tmp) cout << p << ' ';



}
/*




*/

Compilation message (stderr)

naan.cpp:56:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   56 | main(){
      | ^~~~
naan.cpp: In function 'int main()':
naan.cpp:80:29: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   80 |                 int mid = r + l >> 1;
      |                           ~~^~~
naan.cpp:76:30: warning: unused variable 't1' [-Wunused-variable]
   76 |             int l =0, r = L, t1 = -1,t2 = -1;
      |                              ^~
naan.cpp:104:71: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  104 |             if(idx == -1 || check(c[i][j], ma) && check(pos, c[i][j]) && !okla(pos, c[i][j])){
      |                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
naan.cpp:72:9: warning: variable 'last' set but not used [-Wunused-but-set-variable]
   72 |     int last = 0;
      |         ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 24 / 24
• Subtask 3: 71 / 71