Submission #1072935

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072935		phong	Two Antennas (JOI19_antennas)	C++17	0 / 100	3022 ms	73040 KiB

antennas

#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];
bool check(pii t1, pii t2){
    return t1.fi * t2.se <= t1.se * t2.fi;
}
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};
    int lc = __gcd(tx.fi, tx.se);
    return {tx.fi / lc, tx.se / lc};
}
pii c[nmax][nmax];
bool okla(pii t1, pii t2){
    int lc = __gcd(t1.fi, t1.se);
    t1.fi/= lc;
    t1.se /= lc;
    lc = __gcd(t2.fi, t2.se);
    t2.fi /= lc;
    t2.se /= lc;
    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] = {oo,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;
            }
            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]) 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)

antennas.cpp:48:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   48 | main(){
      | ^~~~
antennas.cpp: In function 'int main()':
antennas.cpp:72:29: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   72 |                 int mid = r + l >> 1;
      |                           ~~^~~
antennas.cpp:68:30: warning: unused variable 't1' [-Wunused-variable]
   68 |             int l =0, r = L, t1 = -1,t2 = -1;
      |                              ^~
antennas.cpp:95:71: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   95 |             if(idx == -1 || check(c[i][j], ma) && check(pos, c[i][j]) && !okla(pos, c[i][j])){
      |                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:64:9: warning: variable 'last' set but not used [-Wunused-but-set-variable]
   64 |     int last = 0;
      |         ^~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 65