0_0_6534211_30792.cpp: In function `int main()':
0_0_6534211_30792.cpp:123: error: `mat' undeclared (first use this function)
0_0_6534211_30792.cpp:123: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6534211_30792.cpp:123: error: expected `;' before "res"
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