0_0_5516507_23048.cpp: In function `int main()':
0_0_5516507_23048.cpp:20: error: `i' undeclared (first use this function)
0_0_5516507_23048.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5516507_23048.cpp:25: error: `substr' undeclared (first use this function)
0_0_5516507_23048.cpp:27: error: no match for 'operator==' in 's1 == 1'
0_0_5516507_23048.cpp:27: error: no match for 'operator==' in 's2 == 1'
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