Borderou de evaluare (job #519397)

Eroare de compilare: user.cpp: In function 'int solve()': user.cpp:12:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:15:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function 'int main()': user.cpp:31:6: error: expected ';' before 'ifstream' user.cpp:31:31: warning: statement has no effect [-Wunused-value] user.cpp:32:7: error: expected ';' before 'ofstream' user.cpp:32:33: warning: statement has no effect [-Wunused-value]