Compilare: main.cpp: In function 'int main(int, const char**)': main.cpp:59:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi3.in", "r", stdin) ; ^ main.cpp:60:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi3.out", "w", stdout) ; ^ main.cpp: In function 'void solveColor(int)': main.cpp:55:33: warning: 'pozj' may be used uninitialized in this function [-Wmaybe-uninitialized] sol.emplace_back(std::make_pair(pozi, pozj)) ; ~~~~~~~~~~~~~~^~~~~~~~~~~~ main.cpp:55:33: warning: 'pozi' may be used uninitialized in this function [-Wmaybe-uninitialized]