View Compilation Error

0_0_25283367_19663.cpp: In function 'int main()':
0_0_25283367_19663.cpp:52:16: error: 's' was not declared in this scope
         memset(s, 0, sizeof(s));
                ^
0_0_25283367_19663.cpp:53:13: error: redeclaration of 'int j'
         int j = 0;
             ^
0_0_25283367_19663.cpp:50:13: note: 'int j' previously declared here
         int j=0;
             ^
0_0_25283367_19663.cpp:54:25: error: 'M' was not declared in this scope
          for(int i=0; i<M; i++)
                         ^
0_0_25283367_19663.cpp:56:21: error: 'N' was not declared in this scope
             while(j<N && mec[j].x>=task[i].x)
                     ^