oj.uz

Submission #452107

# Submission time Handle Problem Language Result Execution time Memory
452107 2021-08-03T19:17:32 Z dxz05 Bomb (IZhO17_bomb) C++14
35 / 100
 1000 ms 55916 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];
        }
    }

    if (n < m){
        for (int i = 1; i <= n; i++){
            int l = 1, r = m;
            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 <= m; i++){
            int l = 1, r = n;
            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:162:9: note: in expansion of macro 'debug'
  162 |         debug(test);
      |         ^~~~~

Subtask #1
35.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 460 KB Output is correct
3 Correct 28 ms 26540 KB Output is correct
4 Correct 30 ms 26560 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 384 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 4 ms 972 KB Output is correct
18 Correct 2 ms 1100 KB Output is correct
19 Correct 5 ms 1356 KB Output is correct
20 Correct 6 ms 1356 KB Output is correct
21 Correct 2 ms 844 KB Output is correct
22 Correct 3 ms 1100 KB Output is correct
23 Correct 14 ms 1356 KB Output is correct
24 Correct 5 ms 1232 KB Output is correct
25 Correct 21 ms 1460 KB Output is correct
26 Correct 112 ms 1476 KB Output is correct
27 Correct 936 ms 4044 KB Output is correct
28 Correct 150 ms 4228 KB Output is correct
29 Execution timed out 1087 ms 5324 KB Time limit exceeded
30 Execution timed out 1088 ms 6220 KB Time limit exceeded
31 Execution timed out 1093 ms 4940 KB Time limit exceeded
32 Correct 722 ms 5796 KB Output is correct
33 Execution timed out 1082 ms 6604 KB Time limit exceeded
34 Correct 110 ms 4688 KB Output is correct
35 Correct 610 ms 6632 KB Output is correct
36 Execution timed out 1061 ms 6604 KB Time limit exceeded
37 Correct 1 ms 460 KB Output is correct
38 Execution timed out 1091 ms 55720 KB Time limit exceeded
39 Correct 1 ms 460 KB Output is correct
40 Execution timed out 1093 ms 15432 KB Time limit exceeded
41 Correct 1 ms 460 KB Output is correct
42 Correct 74 ms 1440 KB Output is correct
43 Execution timed out 1093 ms 55816 KB Time limit exceeded
44 Execution timed out 1084 ms 6604 KB Time limit exceeded
45 Execution timed out 1072 ms 55748 KB Time limit exceeded
46 Execution timed out 1092 ms 55748 KB Time limit exceeded
47 Execution timed out 1102 ms 55820 KB Time limit exceeded
48 Execution timed out 1100 ms 55728 KB Time limit exceeded
49 Execution timed out 1093 ms 55876 KB Time limit exceeded
50 Execution timed out 1045 ms 55748 KB Time limit exceeded
51 Execution timed out 1064 ms 55732 KB Time limit exceeded
52 Execution timed out 1093 ms 55748 KB Time limit exceeded
53 Execution timed out 1098 ms 55800 KB Time limit exceeded
54 Execution timed out 1096 ms 55736 KB Time limit exceeded
55 Execution timed out 1094 ms 55820 KB Time limit exceeded
56 Execution timed out 1100 ms 55796 KB Time limit exceeded
57 Execution timed out 1099 ms 55748 KB Time limit exceeded
58 Execution timed out 1098 ms 55884 KB Time limit exceeded
59 Execution timed out 1101 ms 55748 KB Time limit exceeded
60 Execution timed out 1088 ms 55748 KB Time limit exceeded
61 Execution timed out 1093 ms 55748 KB Time limit exceeded
62 Execution timed out 1089 ms 55780 KB Time limit exceeded
63 Execution timed out 1086 ms 55900 KB Time limit exceeded
64 Execution timed out 1083 ms 55740 KB Time limit exceeded
65 Execution timed out 1094 ms 55744 KB Time limit exceeded
66 Execution timed out 1098 ms 55808 KB Time limit exceeded
67 Execution timed out 1092 ms 55748 KB Time limit exceeded
68 Execution timed out 1054 ms 55796 KB Time limit exceeded
69 Execution timed out 1093 ms 55748 KB Time limit exceeded
70 Execution timed out 1090 ms 44676 KB Time limit exceeded
71 Execution timed out 1067 ms 55908 KB Time limit exceeded
72 Execution timed out 1091 ms 55712 KB Time limit exceeded
73 Execution timed out 1097 ms 55748 KB Time limit exceeded
74 Execution timed out 1096 ms 55748 KB Time limit exceeded
75 Execution timed out 1095 ms 55748 KB Time limit exceeded
76 Execution timed out 1099 ms 55736 KB Time limit exceeded
77 Execution timed out 1092 ms 55800 KB Time limit exceeded
78 Execution timed out 1094 ms 55748 KB Time limit exceeded
79 Execution timed out 1060 ms 55752 KB Time limit exceeded
80 Execution timed out 1097 ms 55792 KB Time limit exceeded
81 Execution timed out 1098 ms 55748 KB Time limit exceeded
82 Execution timed out 1099 ms 55720 KB Time limit exceeded
83 Execution timed out 1095 ms 55728 KB Time limit exceeded
84 Execution timed out 1099 ms 55732 KB Time limit exceeded
85 Execution timed out 1101 ms 55748 KB Time limit exceeded
86 Execution timed out 1074 ms 55748 KB Time limit exceeded
87 Execution timed out 1069 ms 55876 KB Time limit exceeded
88 Execution timed out 1082 ms 55748 KB Time limit exceeded
89 Execution timed out 1097 ms 55748 KB Time limit exceeded
90 Execution timed out 1100 ms 44664 KB Time limit exceeded
91 Execution timed out 1084 ms 55800 KB Time limit exceeded
92 Execution timed out 1096 ms 55748 KB Time limit exceeded
93 Execution timed out 1087 ms 55916 KB Time limit exceeded
94 Execution timed out 1099 ms 55748 KB Time limit exceeded
95 Execution timed out 1096 ms 55836 KB Time limit exceeded
96 Execution timed out 1103 ms 55748 KB Time limit exceeded
97 Execution timed out 1092 ms 55728 KB Time limit exceeded
98 Execution timed out 1091 ms 55888 KB Time limit exceeded
99 Execution timed out 1094 ms 55748 KB Time limit exceeded
100 Execution timed out 1101 ms 55796 KB Time limit exceeded