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int **arr = new int*[n];
for(size_t i = 0; i!=n; ++i)
	arr = new int[m];
 
int **arr = new int*[n];
arr[0] = new int[n*m];
for(size_t i = 1; i!=n; ++i)
	arr = arr[i-1] + m;

prog.cpp:1:22: error: 'n' was not declared in this scope
 int **arr = new int*[n];
                      ^
prog.cpp:2:1: error: expected unqualified-id before 'for'
 for(size_t i = 0; i!=n; ++i)
 ^
prog.cpp:2:19: error: 'i' does not name a type
 for(size_t i = 0; i!=n; ++i)
                   ^
prog.cpp:2:25: error: expected unqualified-id before '++' token
 for(size_t i = 0; i!=n; ++i)
                         ^
prog.cpp:5:7: error: redefinition of 'int** arr'
 int **arr = new int*[n];
       ^
prog.cpp:1:7: note: 'int** arr' previously declared here
 int **arr = new int*[n];
       ^
prog.cpp:5:22: error: 'n' was not declared in this scope
 int **arr = new int*[n];
                      ^
prog.cpp:6:1: error: 'arr' does not name a type
 arr[0] = new int[n*m];
 ^
prog.cpp:7:1: error: expected unqualified-id before 'for'
 for(size_t i = 1; i!=n; ++i)
 ^
prog.cpp:7:19: error: 'i' does not name a type
 for(size_t i = 1; i!=n; ++i)
                   ^
prog.cpp:7:25: error: expected unqualified-id before '++' token
 for(size_t i = 1; i!=n; ++i)
                         ^

Standard output is empty