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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define main dummy_main
  4. int main(){
  5.   return 0;
  6. }
  7. #undef main
  8. class SnapshotArray{
  9.   int cur;
  10.   vector<int> t[50000], v[50000];
  11.   public:
  12.   SnapshotArray(int length){
  13.     int i;
  14.     cur = 0;
  15.     for(i=0;i<(length);i++){
  16.       v[i].push_back(0);
  17.     }
  18.     for(i=0;i<(length);i++){
  19.       t[i].push_back(0);
  20.     }
  21.   }
  22.   void set(int index, int val){
  23.     if(t[index][t[index].size()-1] == cur){
  24.       v[index][v[index].size()-1] = val;
  25.     }
  26.     else{
  27.       v[index].push_back(val);
  28.       t[index].push_back(cur);
  29.     }
  30.   }
  31.   int snap(){
  32.     return cur++;
  33.   }
  34.   int get(int index, int snap_id){
  35.     int i;
  36.     i = upper_bound(t[index].begin(), t[index].end(), snap_id) - t[index].begin();
  37.     return v[index][i-1];
  38.   }
  39. }
  40. ;
  41. // cLay varsion 20190810-2
  42.  
  43. // --- original code ---
  44. // #define main dummy_main
  45. // {}
  46. // #undef main
  47. // 
  48. // class SnapshotArray {
  49. // public:
  50. //   vector<int> v[50000], t[50000];
  51. //   int cur;
  52. //   
  53. //   SnapshotArray(int length) {
  54. //     int i;
  55. //     cur = 0;
  56. //     rep(i,length) v[i].push_back(0);
  57. //     rep(i,length) t[i].push_back(0);
  58. //   }
  59. //   
  60. //   void set(int index, int val) {
  61. //     if(t[index][t[index].size()-1] == cur){
  62. //       v[index][v[index].size()-1] = val;
  63. //     } else {
  64. //       v[index].push_back(val);
  65. //       t[index].push_back(cur);
  66. //     }
  67. //   }
  68. //   
  69. //   int snap() {
  70. //     return cur++;
  71. //   }
  72. //   
  73. //   int get(int index, int snap_id) {
  74. //     int i;
  75. //     i = upper_bound(t[index].begin(), t[index].end(), snap_id) - t[index].begin();
  76. //     return v[index][i-1];
  77. //   }
  78. // };
  79.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/DQk1yM
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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