Compilare: user.cpp: In function ‘void solve()’: user.cpp:63:15: warning: unused variable ‘i1’ [-Wunused-variable] long long i1 = 1, i2 = 1; ^~ user.cpp:63:23: warning: unused variable ‘i2’ [-Wunused-variable] long long i1 = 1, i2 = 1; ^~ user.cpp: In function ‘int main()’: user.cpp:74:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("brackets2.in", "r", stdin); ^ user.cpp:75:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("brackets2.out", "w", stdout); ^