oj.uz

Submission #334003

# Submission time Handle Problem Language Result Execution time Memory
334003 2020-12-08T05:20:12 Z juggernaut Bomb (IZhO17_bomb) C++14
33 / 100
 1000 ms 56816 KB 
#include<bits/stdc++.h>
using namespace std;
int n,m,mx,cnt[2505][2505],pref[2505][2505];
bool a[2505][2505];
char rd(){
    char ch;
    do{
        scanf("%c",&ch);
    }while(ch!='0'&&ch!='1');
    return ch;
}
bool sum(int x,int y,int x2,int y2){
    return (cnt[x2][y2]-cnt[x2][y-1]-cnt[x-1][y2]+cnt[x-1][y-1])==((x2-x+1)*(y2-y+1));
}
bool check(int x,int y){
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)pref[i][j]=0;
    for(int i=1;i+x-1<=n;i++)
        for(int j=1;j+y-1<=m;j++)
            if(sum(i,j,i+x-1,j+y-1)){
                for(int k=i;k<=i+x-1;k++)pref[k][j]++,pref[k][j+y]--;
            }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            pref[i][j]+=pref[i][j-1];
            if(a[i][j]&&!pref[i][j])return false;
        }
    }
    return true;
}
bool check_1(int x,int y){
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)pref[i][j]=0;
    for(int i=1;i+x-1<=n;i++)
        for(int j=1;j+y-1<=m;j++)
            if(sum(i,j,i+x-1,j+y-1)){
                for(int k=j;k<=j+y-1;k++)pref[i][k]++,pref[i+x][k]--;
            }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            pref[i][j]+=pref[i-1][j];
            if(a[i][j]&&!pref[i][j])return false;
        }
    }
    return true;
}
int main(){
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++){
            a[i][j]=(rd()=='1');
            cnt[i][j]=cnt[i-1][j]+cnt[i][j-1]-cnt[i-1][j-1]+a[i][j];
        }
//    if(n<m){
        for(int x=1;x<=m;x++){
            int l=1,r=n;
            while(l<r){
                int mid=(l+r+1)>>1;
                if(check_1(mid,x))l=mid;
                else r=mid-1;
            }
            if(!check_1(l,x))l=0;
            mx=max(mx,x*l);
        }
        printf("%d",mx);
//    }else{
//        for(int x=1;x<=n;x++){
//            int l=1,r=m;
//            while(l<r){
//                int mid=(l+r+1)>>1;
//                if(check_1(x,mid))l=mid;
//                else r=mid-1;
//            }
//            if(!check_1(x,l))l=0;
//            mx=max(mx,x*l);
//        }
//        printf("%d",mx);
    //}
}

Compilation message

bomb.cpp: In function 'char rd()':
bomb.cpp:8:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |         scanf("%c",&ch);
      |         ~~~~~^~~~~~~~~~
bomb.cpp: In function 'int main()':
bomb.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   48 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~

Subtask #1
33.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 18 ms 26604 KB Output is correct
4 Correct 17 ms 26516 KB Output is correct
5 Correct 77 ms 428 KB Output is correct
6 Correct 73 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 492 KB Output is correct
17 Correct 5 ms 1004 KB Output is correct
18 Correct 4 ms 1132 KB Output is correct
19 Correct 8 ms 1388 KB Output is correct
20 Correct 9 ms 1388 KB Output is correct
21 Correct 5 ms 876 KB Output is correct
22 Correct 8 ms 1132 KB Output is correct
23 Correct 16 ms 1520 KB Output is correct
24 Correct 7 ms 1260 KB Output is correct
25 Correct 17 ms 1516 KB Output is correct
26 Correct 90 ms 1516 KB Output is correct
27 Execution timed out 1083 ms 4076 KB Time limit exceeded
28 Correct 488 ms 4308 KB Output is correct
29 Execution timed out 1053 ms 5356 KB Time limit exceeded
30 Execution timed out 1045 ms 6252 KB Time limit exceeded
31 Execution timed out 1087 ms 4972 KB Time limit exceeded
32 Correct 820 ms 5876 KB Output is correct
33 Execution timed out 1087 ms 6636 KB Time limit exceeded
34 Correct 241 ms 4716 KB Output is correct
35 Execution timed out 1088 ms 6636 KB Time limit exceeded
36 Execution timed out 1070 ms 6636 KB Time limit exceeded
37 Correct 1 ms 492 KB Output is correct
38 Execution timed out 1091 ms 55532 KB Time limit exceeded
39 Correct 1 ms 640 KB Output is correct
40 Execution timed out 1088 ms 15596 KB Time limit exceeded
41 Correct 1 ms 492 KB Output is correct
42 Correct 35 ms 1516 KB Output is correct
43 Execution timed out 1089 ms 55532 KB Time limit exceeded
44 Execution timed out 1071 ms 6636 KB Time limit exceeded
45 Execution timed out 1089 ms 56172 KB Time limit exceeded
46 Execution timed out 1092 ms 56096 KB Time limit exceeded
47 Execution timed out 1099 ms 56160 KB Time limit exceeded
48 Execution timed out 1090 ms 56300 KB Time limit exceeded
49 Execution timed out 1099 ms 56300 KB Time limit exceeded
50 Execution timed out 1050 ms 56300 KB Time limit exceeded
51 Execution timed out 1090 ms 56300 KB Time limit exceeded
52 Execution timed out 1102 ms 56156 KB Time limit exceeded
53 Execution timed out 1099 ms 56368 KB Time limit exceeded
54 Execution timed out 1084 ms 55488 KB Time limit exceeded
55 Execution timed out 1083 ms 55660 KB Time limit exceeded
56 Execution timed out 1024 ms 56812 KB Time limit exceeded
57 Execution timed out 1084 ms 56688 KB Time limit exceeded
58 Execution timed out 1103 ms 56684 KB Time limit exceeded
59 Execution timed out 1094 ms 56752 KB Time limit exceeded
60 Execution timed out 1094 ms 56796 KB Time limit exceeded
61 Execution timed out 1101 ms 56724 KB Time limit exceeded
62 Execution timed out 1094 ms 56768 KB Time limit exceeded
63 Execution timed out 1091 ms 56740 KB Time limit exceeded
64 Execution timed out 1092 ms 56780 KB Time limit exceeded
65 Execution timed out 1095 ms 56816 KB Time limit exceeded
66 Execution timed out 1087 ms 56812 KB Time limit exceeded
67 Execution timed out 1091 ms 56308 KB Time limit exceeded
68 Execution timed out 1102 ms 56556 KB Time limit exceeded
69 Execution timed out 1080 ms 56300 KB Time limit exceeded
70 Execution timed out 1093 ms 45676 KB Time limit exceeded
71 Execution timed out 1091 ms 56556 KB Time limit exceeded
72 Execution timed out 1097 ms 56428 KB Time limit exceeded
73 Execution timed out 1095 ms 56684 KB Time limit exceeded
74 Execution timed out 1094 ms 56684 KB Time limit exceeded
75 Execution timed out 1084 ms 56684 KB Time limit exceeded
76 Execution timed out 1089 ms 56684 KB Time limit exceeded
77 Execution timed out 1094 ms 56556 KB Time limit exceeded
78 Execution timed out 1088 ms 55928 KB Time limit exceeded
79 Execution timed out 1085 ms 55560 KB Time limit exceeded
80 Execution timed out 1088 ms 55404 KB Time limit exceeded
81 Execution timed out 1095 ms 55408 KB Time limit exceeded
82 Execution timed out 1096 ms 55404 KB Time limit exceeded
83 Execution timed out 1095 ms 55404 KB Time limit exceeded
84 Execution timed out 1098 ms 55528 KB Time limit exceeded
85 Execution timed out 1097 ms 55532 KB Time limit exceeded
86 Execution timed out 1096 ms 55532 KB Time limit exceeded
87 Execution timed out 1095 ms 55532 KB Time limit exceeded
88 Execution timed out 1096 ms 55436 KB Time limit exceeded
89 Execution timed out 1094 ms 55532 KB Time limit exceeded
90 Execution timed out 1095 ms 44396 KB Time limit exceeded
91 Execution timed out 1099 ms 55532 KB Time limit exceeded
92 Execution timed out 1094 ms 55532 KB Time limit exceeded
93 Execution timed out 1095 ms 55532 KB Time limit exceeded
94 Execution timed out 1097 ms 55532 KB Time limit exceeded
95 Execution timed out 1094 ms 55404 KB Time limit exceeded
96 Execution timed out 1096 ms 55532 KB Time limit exceeded
97 Execution timed out 1092 ms 55532 KB Time limit exceeded
98 Execution timed out 1092 ms 55404 KB Time limit exceeded
99 Execution timed out 1100 ms 55532 KB Time limit exceeded
100 Execution timed out 1079 ms 55532 KB Time limit exceeded