Compilare: main.cpp: In function 'int main()': main.cpp:196:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("popcorn.out", "w", stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:20:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 131072, fin); ^ main.cpp: In function 'int solve(int, int)': main.cpp:191:21: warning: 'cost' may be used uninitialized in this function [-Wmaybe-uninitialized] return cost + k * last; ^~~~ main.cpp:191:19: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] return cost + k * last; ~~^~~~~~