oj.uz

Submission #456307

# Submission time Handle Problem Language Result Execution time Memory
456307 2021-08-06T11:40:43 Z dxz05 Bomb (IZhO17_bomb) C++14
45 / 100
 1000 ms 57648 KB 
#pragma GCC optimize("Ofast,O2,O3")
#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define revall(x) (x).rbegin(), (x).rend()

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.00001;
const int MOD = 1e9;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 2e6 + 3e2;
const int M = 2522;

int n, m;
int a[M][M];
bool bomb[M][M];
int dp[M][M];

int sum(int x1, int y1, int x2, int y2){
    assert(x1 <= x2 && y1 <= y2);
    int res = dp[x2][y2];
    res -= dp[x1 - 1][y2];
    res -= dp[x2][y1 - 1];
    res += dp[x1 - 1][y1 - 1];
    return res;
}

int ans = 0;

bool check(int A, int B){
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++) bomb[i][j] = false;
    }

    for (int i = 1; i <= n - A + 1; i++){
        for (int j = 1; j <= m - B + 1; j++){
            if (!a[i][j]) continue;
            if (sum(i, j, i + A - 1, j + B - 1) == A * B){
                for (int x = i; x <= i + A - 1; x++){
                    for (int y = j; y <= j + B - 1; y++){
                        bomb[x][y] = true;
                    }
                }
            }
        }
    }

//    for (int i = n; i >= A; i--){
//        for (int j = m; j >= B; j--){
//            if (!a[i][j]) continue;
//            if (sum(i - A + 1, j - B + 1, i, j) == A * B){
//                for (int x = i - A + 1; x <= i; x++){
//                    for (int y = j - B + 1; y <= j; y++){
//                        bomb[x][y] = true;
//                    }
//                }
//            }
//        }
//    }

    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++){
            if (!bomb[i][j] && a[i][j]) return false;
        }
    }

    ans = max(ans, A * B);

    return true;
}

void solve(int TC) {
    cin >> n >> m;

    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++){
            char ch;
            cin >> ch;
            a[i][j] = ch - '0';
            dp[i][j] = dp[i][j - 1] + a[i][j];
        }
    }

    for (int j = 1; j <= m; j++){
        for (int i = 1; i <= n; i++){
            dp[i][j] += dp[i - 1][j];
        }
    }

    int A = n, B = m;
    for (int j = 1; j <= m; j++){
        for (int i = 1; i <= n; i++){
            if (a[i][j] == 0) continue;
            int k = i;
            while (k <= n && a[k][j] == 1) k++;
            A = min(A, k - i);
            i = k - 1;
        }
    }

    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++){
            if (a[i][j] == 0) continue;
            int k = j;
            while (k <= m && a[i][k] == 1) k++;
            B = min(B, k - j);
            j = k - 1;
        }
    }

    if (check(A, B)){
        cout << ans;
        return;
    }

    if (A < B){
        for (int i = 1; i <= A; i++){
            int l = 1, r = B;
            while (l <= r){
                int mid = (l + r) >> 1;
                if (check(i, mid)){
                    l = mid + 1;
                } else r = mid - 1;
            }
        }
    } else {
        for (int i = 1; i <= B; i++){
            int l = 1, r = A;
            while (l <= r){
                int mid = (l + r) >> 1;
                if (check(mid, i)){
                    l = mid + 1;
                } else r = mid - 1;
            }
        }
    }

    cout << ans;

}

int main() {
    startTime = clock();
    cin.tie(nullptr);
    cout.tie(nullptr);
    ios_base::sync_with_stdio(false);

    bool llololcal = false;
#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    llololcal = true;
#endif

    int TC = 1;
    //cin >> TC;

    for (int test = 1; test <= TC; test++) {
        debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

    if (llololcal) cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;

    return 0;
}

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:19:20: warning: statement has no effect [-Wunused-value]
   19 | #define debug(...) 42
      |                    ^~
bomb.cpp:188:9: note: in expansion of macro 'debug'
  188 |         debug(test);
      |         ^~~~~

Subtask #1
45.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 456 KB Output is correct
3 Correct 13 ms 26552 KB Output is correct
4 Correct 13 ms 26572 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 460 KB Output is correct
12 Correct 1 ms 460 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 1 ms 460 KB Output is correct
17 Correct 1 ms 972 KB Output is correct
18 Correct 1 ms 1100 KB Output is correct
19 Correct 3 ms 1348 KB Output is correct
20 Correct 4 ms 1356 KB Output is correct
21 Correct 1 ms 844 KB Output is correct
22 Correct 2 ms 1100 KB Output is correct
23 Correct 8 ms 1356 KB Output is correct
24 Correct 3 ms 1220 KB Output is correct
25 Correct 14 ms 1356 KB Output is correct
26 Correct 2 ms 1356 KB Output is correct
27 Correct 4 ms 4044 KB Output is correct
28 Correct 9 ms 4300 KB Output is correct
29 Execution timed out 1081 ms 5456 KB Time limit exceeded
30 Execution timed out 1091 ms 6476 KB Time limit exceeded
31 Correct 891 ms 5144 KB Output is correct
32 Correct 365 ms 5964 KB Output is correct
33 Execution timed out 1084 ms 6732 KB Time limit exceeded
34 Correct 10 ms 4684 KB Output is correct
35 Correct 73 ms 6732 KB Output is correct
36 Correct 46 ms 6732 KB Output is correct
37 Correct 1 ms 460 KB Output is correct
38 Correct 194 ms 57568 KB Output is correct
39 Correct 1 ms 460 KB Output is correct
40 Execution timed out 1094 ms 16232 KB Time limit exceeded
41 Correct 1 ms 460 KB Output is correct
42 Correct 63 ms 1452 KB Output is correct
43 Execution timed out 1088 ms 57500 KB Time limit exceeded
44 Execution timed out 1089 ms 6732 KB Time limit exceeded
45 Execution timed out 1089 ms 57600 KB Time limit exceeded
46 Correct 215 ms 57540 KB Output is correct
47 Execution timed out 1093 ms 57552 KB Time limit exceeded
48 Execution timed out 1089 ms 57648 KB Time limit exceeded
49 Correct 414 ms 57524 KB Output is correct
50 Execution timed out 1086 ms 57600 KB Time limit exceeded
51 Execution timed out 1081 ms 57604 KB Time limit exceeded
52 Execution timed out 1095 ms 57608 KB Time limit exceeded
53 Execution timed out 1092 ms 57600 KB Time limit exceeded
54 Execution timed out 1087 ms 57604 KB Time limit exceeded
55 Execution timed out 1091 ms 57548 KB Time limit exceeded
56 Correct 207 ms 57600 KB Output is correct
57 Execution timed out 1100 ms 57544 KB Time limit exceeded
58 Execution timed out 1102 ms 57412 KB Time limit exceeded
59 Execution timed out 1075 ms 57412 KB Time limit exceeded
60 Correct 631 ms 57380 KB Output is correct
61 Correct 449 ms 57376 KB Output is correct
62 Execution timed out 1094 ms 57316 KB Time limit exceeded
63 Correct 903 ms 57372 KB Output is correct
64 Correct 251 ms 57284 KB Output is correct
65 Execution timed out 1094 ms 57344 KB Time limit exceeded
66 Execution timed out 1095 ms 57412 KB Time limit exceeded
67 Execution timed out 1086 ms 57352 KB Time limit exceeded
68 Execution timed out 1090 ms 57292 KB Time limit exceeded
69 Execution timed out 1068 ms 57344 KB Time limit exceeded
70 Execution timed out 1049 ms 46148 KB Time limit exceeded
71 Execution timed out 1059 ms 57376 KB Time limit exceeded
72 Execution timed out 1090 ms 57352 KB Time limit exceeded
73 Execution timed out 1089 ms 57300 KB Time limit exceeded
74 Execution timed out 1077 ms 57364 KB Time limit exceeded
75 Execution timed out 1078 ms 57348 KB Time limit exceeded
76 Execution timed out 1081 ms 57352 KB Time limit exceeded
77 Execution timed out 1089 ms 57276 KB Time limit exceeded
78 Execution timed out 1095 ms 57344 KB Time limit exceeded
79 Execution timed out 1093 ms 57344 KB Time limit exceeded
80 Execution timed out 1084 ms 57352 KB Time limit exceeded
81 Execution timed out 1095 ms 57284 KB Time limit exceeded
82 Execution timed out 1094 ms 57344 KB Time limit exceeded
83 Execution timed out 1096 ms 57352 KB Time limit exceeded
84 Execution timed out 1100 ms 57344 KB Time limit exceeded
85 Execution timed out 1097 ms 57412 KB Time limit exceeded
86 Execution timed out 1075 ms 57604 KB Time limit exceeded
87 Execution timed out 1074 ms 57576 KB Time limit exceeded
88 Execution timed out 1096 ms 57600 KB Time limit exceeded
89 Execution timed out 1088 ms 57600 KB Time limit exceeded
90 Execution timed out 1077 ms 46456 KB Time limit exceeded
91 Execution timed out 1089 ms 57608 KB Time limit exceeded
92 Execution timed out 1085 ms 57604 KB Time limit exceeded
93 Execution timed out 1090 ms 57608 KB Time limit exceeded
94 Execution timed out 1093 ms 57536 KB Time limit exceeded
95 Execution timed out 1088 ms 57540 KB Time limit exceeded
96 Execution timed out 1085 ms 57504 KB Time limit exceeded
97 Execution timed out 1080 ms 57592 KB Time limit exceeded
98 Execution timed out 1089 ms 57600 KB Time limit exceeded
99 Execution timed out 1083 ms 57620 KB Time limit exceeded
100 Execution timed out 1078 ms 57476 KB Time limit exceeded