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View Compilation Error

0_0_9148666_14066.cpp:15: error: `main' must return `int'
0_0_9148666_14066.cpp: In function `int main(...)':
0_0_9148666_14066.cpp:15: error: `clock_t' undeclared (first use this function)
0_0_9148666_14066.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9148666_14066.cpp:15: error: expected `;' before "start"
0_0_9148666_14066.cpp:15: error: `calloc' undeclared (first use this function)
0_0_9148666_14066.cpp:23: error: `start' undeclared (first use this function)
0_0_9148666_14066.cpp:23: error: `clock' undeclared (first use this function)
0_0_9148666_14066.cpp:27: error: `end' undeclared (first use this function)
0_0_9148666_14066.cpp:31: error: `CLOCKS_PER_SEC' undeclared (first use this function)
0_0_9148666_14066.cpp:33: error: `free' undeclared (first use this function)
0_0_9148666_14066.cpp: At global scope:
0_0_9148666_14066.cpp:34: error: expected declaration before '}' token


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