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View Compilation Error

0_0_15395872_12039.cpp:9:2: error: '_int64' does not name a type
  _int64 sum;
  ^
0_0_15395872_12039.cpp: In function 'void change(int, int, int)':
0_0_15395872_12039.cpp:20:8: error: 'struct COW' has no member named 'sum'
   a[i].sum+=x;
        ^
0_0_15395872_12039.cpp: At global scope:
0_0_15395872_12039.cpp:26:1: error: '_int64' does not name a type
 _int64 qiu_sum(int i) {
 ^
0_0_15395872_12039.cpp:36:1: error: '_int64' does not name a type
 _int64 qiu_cnt(int i) {
 ^
0_0_15395872_12039.cpp: In function 'int main()':
0_0_15395872_12039.cpp:49:3: error: '_int64' was not declared in this scope
   _int64 answer=0;
   ^
0_0_15395872_12039.cpp:55:11: error: expected ';' before 't1'
    _int64 t1=i-qiu_cnt(cow);
           ^
0_0_15395872_12039.cpp:56:7: error: 't1' was not declared in this scope
    if(t1!=0) {
       ^
0_0_15395872_12039.cpp:57:12: error: expected ';' before 't2'
     _int64 t2=qiu_sum(N)-qiu_sum(cow);
            ^
0_0_15395872_12039.cpp:58:5: error: 'answer' was not declared in this scope
     answer+=t1*cow+t2;
     ^
0_0_15395872_12039.cpp:58:20: error: 't2' was not declared in this scope
     answer+=t1*cow+t2;
                    ^
0_0_15395872_12039.cpp:62:20: error: 'answer' was not declared in this scope
   printf("%I64d\n",answer);
                    ^


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