oj.uz

Submission #55455

# Submission time Handle Problem Language Result Execution time Memory
55455 2018-07-07T14:49:07 Z BThero Bomb (IZhO17_bomb) C++17
42 / 100
 1000 ms 132096 KB 
// Why I am so dumb? :c
#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair

#define all(x) (x).begin(), (x).end()

#define fi first
#define se second

using namespace std;

typedef long long ll;

int pref[2505][2505];

int arr[2505][2505];

char s[2505][2505];

int n, m, ans;

bool cmp(pair<int,int> a, pair<int,int> b) {
    return a.fi * a.se < b.fi * b.se;
}

int rectSum(int ax, int ay, int bx, int by) {
    int ret = pref[bx][by];

    ret -= pref[ax - 1][by];
    ret -= pref[bx][ay - 1];
    ret += pref[ax - 1][ay - 1];

    return ret;
}

void updRect(int ax, int ay, int bx, int by) {
    ++arr[bx][by];
    --arr[ax - 1][by];
    --arr[bx][ay - 1];
    ++arr[ax - 1][ay - 1];
}

bool check(int x, int y, bool dbg = 0) {
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            arr[i][j] = 0;
        }
    }

    for (int cx = x; cx <= n; ++cx) {
        for (int cy = y; cy <= m; ++cy) {
            if (rectSum(cx - x + 1, cy - y + 1, cx, cy) == x * y) {
                if (dbg) {
                    printf("NEW RECT: ");
                    printf("%d %d\n", cx, cy);
                }

                updRect(cx - x + 1, cy - y + 1, cx, cy);                
            }
        }
    }

    for (int i = n; i > 0; --i) {
        for (int j = m; j > 0; --j) {
            arr[i][j] -= arr[i + 1][j + 1];
            arr[i][j] += arr[i + 1][j];
            arr[i][j] += arr[i][j + 1];
        }
    }
    
    bool good = 1;

    if (dbg) {
        printf("----------------------\n");

        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= m; ++j) {
                printf("%d ", arr[i][j]);
            }

            printf("\n");
        }

        printf("----------------------\n");
    }

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            if (s[i][j] == '1' && arr[i][j] == 0) {
                good = 0;
            }
        }
    }

    return good;
}

void solve() {
    scanf("%d %d", &n, &m);

    for (int i = 1; i <= n; ++i) {
        scanf("%s", s[i] + 1);
    }

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            pref[i][j] = (s[i][j] - '0');
            pref[i][j] += pref[i - 1][j];
            pref[i][j] += pref[i][j - 1];
            pref[i][j] -= pref[i - 1][j - 1];
        }
    }

    int limx = n, limy = m;

    for (int i = 1; i <= n; ++i) {
        for (int l = 1, r; l <= m; l = r) {
            r = l + 1;

            if (s[i][l] == '0') {
                continue;
            }

            while (s[i][l] == s[i][r]) {
                ++r;
            }

            limy = min(limy, r - l);            
        }
    }

    for (int i = 1; i <= m; ++i) {
        for (int l = 1, r; l <= n; l = r) {
            r = l + 1;

            if (s[l][i] == '0') {
                continue;
            }

            while (s[l][i] == s[r][i]) {
                ++r;
            }

            limx = min(limx, r - l);
        }    
    }

    ans = 1;
    
    if (n > m) {
        for (int cx = limx, cy = 0; cx > 0; --cx) {
            if (cx * limy <= ans) {
                break;
            }

            while (cy < limy && check(cx, cy + 1)) {
                ++cy;
            }    

            ans = max(ans, cx * cy);
        }
    }
    else {
        for (int cy = limy, cx = 0; cy > 0; --cy) {
            if (cy * limx <= ans) {
                break;
            }

            while (cx < limx && check(cx + 1, cy)) {
                ++cx;
            }

            ans = max(ans, cx * cy);
        }
    }

    printf("%d\n", ans);
}

int main() {
    //freopen("bomb.in", "r", stdin);
    //freopen("bomb.out", "w", stdout);
          
    int tt = 1;

    while (tt--) {
        solve();
    }

    return 0;
}

Compilation message

bomb.cpp: In function 'void solve()':
bomb.cpp:101:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
bomb.cpp:104:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s", s[i] + 1);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
42.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 3 ms 700 KB Output is correct
3 Correct 21 ms 26740 KB Output is correct
4 Correct 21 ms 26740 KB Output is correct
5 Correct 2 ms 26740 KB Output is correct
6 Correct 2 ms 26740 KB Output is correct
7 Correct 3 ms 26740 KB Output is correct
8 Correct 3 ms 26740 KB Output is correct
9 Correct 2 ms 26740 KB Output is correct
10 Correct 2 ms 26740 KB Output is correct
11 Correct 3 ms 26740 KB Output is correct
12 Correct 2 ms 26740 KB Output is correct
13 Correct 2 ms 26740 KB Output is correct
14 Correct 2 ms 26740 KB Output is correct
15 Correct 2 ms 26740 KB Output is correct
16 Correct 2 ms 26740 KB Output is correct
17 Correct 3 ms 26740 KB Output is correct
18 Correct 3 ms 26740 KB Output is correct
19 Correct 5 ms 26740 KB Output is correct
20 Correct 5 ms 26740 KB Output is correct
21 Correct 3 ms 26740 KB Output is correct
22 Correct 3 ms 26740 KB Output is correct
23 Correct 8 ms 26740 KB Output is correct
24 Correct 4 ms 26740 KB Output is correct
25 Correct 8 ms 26740 KB Output is correct
26 Correct 5 ms 26740 KB Output is correct
27 Correct 9 ms 26740 KB Output is correct
28 Correct 15 ms 26740 KB Output is correct
29 Correct 116 ms 26740 KB Output is correct
30 Correct 208 ms 26740 KB Output is correct
31 Correct 138 ms 26740 KB Output is correct
32 Correct 136 ms 26740 KB Output is correct
33 Correct 243 ms 26740 KB Output is correct
34 Correct 16 ms 26740 KB Output is correct
35 Correct 208 ms 26740 KB Output is correct
36 Correct 107 ms 26740 KB Output is correct
37 Correct 3 ms 26740 KB Output is correct
38 Execution timed out 1080 ms 63588 KB Time limit exceeded
39 Correct 4 ms 63588 KB Output is correct
40 Execution timed out 1088 ms 63588 KB Time limit exceeded
41 Correct 2 ms 63588 KB Output is correct
42 Correct 8 ms 63588 KB Output is correct
43 Execution timed out 1071 ms 70364 KB Time limit exceeded
44 Correct 393 ms 70364 KB Output is correct
45 Execution timed out 1077 ms 76676 KB Time limit exceeded
46 Execution timed out 1092 ms 82924 KB Time limit exceeded
47 Execution timed out 1091 ms 89028 KB Time limit exceeded
48 Execution timed out 1077 ms 95012 KB Time limit exceeded
49 Correct 423 ms 101252 KB Output is correct
50 Execution timed out 1079 ms 107236 KB Time limit exceeded
51 Execution timed out 1084 ms 113476 KB Time limit exceeded
52 Execution timed out 1073 ms 119460 KB Time limit exceeded
53 Execution timed out 1080 ms 125712 KB Time limit exceeded
54 Execution timed out 1089 ms 131812 KB Time limit exceeded
55 Execution timed out 1086 ms 132096 KB Time limit exceeded
56 Execution timed out 1083 ms 132096 KB Time limit exceeded
57 Execution timed out 1087 ms 132096 KB Time limit exceeded
58 Execution timed out 1091 ms 132096 KB Time limit exceeded
59 Execution timed out 1080 ms 132096 KB Time limit exceeded
60 Execution timed out 1088 ms 132096 KB Time limit exceeded
61 Runtime error 997 ms 132096 KB Memory limit exceeded 132096 {'time-wall': '1.058', 'max-rss': '56696', 'csw-forced': '90', 'cg-mem': '132096', 'time': '0.997', 'csw-voluntary': '12'} 131072
62 Execution timed out 1083 ms 132096 KB Time limit exceeded
63 Execution timed out 1094 ms 132096 KB Time limit exceeded
64 Execution timed out 1091 ms 132096 KB Time limit exceeded
65 Execution timed out 1071 ms 132096 KB Time limit exceeded
66 Runtime error 912 ms 132096 KB Memory limit exceeded 132096 {'time-wall': '0.961', 'max-rss': '56696', 'csw-forced': '87', 'cg-mem': '132096', 'time': '0.912', 'csw-voluntary': '6'} 131072
67 Execution timed out 1062 ms 132096 KB Time limit exceeded
68 Execution timed out 1090 ms 132096 KB Time limit exceeded
69 Execution timed out 1082 ms 132096 KB Time limit exceeded
70 Execution timed out 1095 ms 132096 KB Time limit exceeded
71 Execution timed out 1075 ms 132096 KB Time limit exceeded
72 Execution timed out 1092 ms 132096 KB Time limit exceeded
73 Execution timed out 1080 ms 132096 KB Time limit exceeded
74 Execution timed out 1088 ms 132096 KB Time limit exceeded
75 Execution timed out 1096 ms 132096 KB Time limit exceeded
76 Execution timed out 1087 ms 132096 KB Time limit exceeded
77 Execution timed out 1084 ms 132096 KB Time limit exceeded
78 Execution timed out 1073 ms 132096 KB Time limit exceeded
79 Execution timed out 1086 ms 132096 KB Time limit exceeded
80 Execution timed out 1073 ms 132096 KB Time limit exceeded
81 Execution timed out 1054 ms 132096 KB Time limit exceeded
82 Execution timed out 1083 ms 132096 KB Time limit exceeded
83 Execution timed out 1016 ms 132096 KB Time limit exceeded
84 Execution timed out 1057 ms 132096 KB Time limit exceeded
85 Execution timed out 1067 ms 132096 KB Time limit exceeded
86 Execution timed out 1088 ms 132096 KB Time limit exceeded
87 Execution timed out 1087 ms 132096 KB Time limit exceeded
88 Execution timed out 1076 ms 132096 KB Time limit exceeded
89 Execution timed out 1089 ms 132096 KB Time limit exceeded
90 Execution timed out 1086 ms 132096 KB Time limit exceeded
91 Execution timed out 1091 ms 132096 KB Time limit exceeded
92 Execution timed out 1100 ms 132096 KB Time limit exceeded
93 Execution timed out 1083 ms 132096 KB Time limit exceeded
94 Execution timed out 1092 ms 132096 KB Time limit exceeded
95 Execution timed out 1085 ms 132096 KB Time limit exceeded
96 Execution timed out 1091 ms 132096 KB Time limit exceeded
97 Execution timed out 1088 ms 132096 KB Time limit exceeded
98 Execution timed out 1063 ms 132096 KB Time limit exceeded
99 Execution timed out 1083 ms 132096 KB Time limit exceeded
100 Execution timed out 1090 ms 132096 KB Time limit exceeded