View Compilation Error

0_0_12690072_28359.cpp: In function `int M_maxsum(int, int)':
0_0_12690072_28359.cpp:5: error: `Max_sum' undeclared (first use this function)
0_0_12690072_28359.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12690072_28359.cpp:5:23: invalid suffix "int" on integer constant
0_0_12690072_28359.cpp:5: error: expected `;' before "Max_i_1"
0_0_12690072_28359.cpp:7: error: `Max_i_1' undeclared (first use this function)
0_0_12690072_28359.cpp:7: error: `maxsum' undeclared (first use this function)
0_0_12690072_28359.cpp:11: error: `a' undeclared (first use this function)