Submission #757295

#	Time	Username	Problem	Language	Result	Execution time	Memory
757295		drdilyor	Seats (IOI18_seats)	C++17	5 / 100	4054 ms	28224 KiB

seats

#include<bits/stdc++.h>
#include "seats.h"
using namespace std;
using ll = long long;

int h, w;
std::vector<int> r, c;
vector<vector<int>> arr;

void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
    h = H;
    w = W;
    r = R;
    c = C;
    arr = vector(H, vector<int>(W, 0));
    for (int i = 0; i < H * W; i++)
        arr[r[i]][c[i]] = i;
#ifdef ONPC
    for (int i = 0; i < H; i++)
        for (int j = 0; j < W; j++)
            cout << arr[i][j] << " \n"[j == W-1];
#endif
}

ll sum(int r1, int c1, int r2, int c2) {
    ll res = 0;
    for (int i = r1; i <= r2; i++) {
        for (int j = c1; j <= c2; j++) {
            res += arr[i][j];
        }
    }
    return res;
}

int swap_seats(int a, int b) {
    swap(arr[r[a]][c[a]], arr[r[b]][c[b]]);
    swap(r[a], r[b]);
    swap(c[a], c[b]);
    int ans = 0;
    for (int r1 = 0; r1 < h; r1++) {
        for (int r2 = r1; r2 < h; r2++) {
            for (int c1 = 0; c1 < w; c1++) {
                for (int c2 = c1; c2 < w; c2++) {
                    ll k = (r2 - r1 + 1) * (c2 - c1 + 1);
                    if (sum(r1, c1, r2, c2) == k * (k-1) / 2)
                        ans ++;
                }
            }
        }
    }
    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30