Compilare: main.cpp: In function 'void queries()': main.cpp:13:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] void queries(){int n;scanf("%d", &n);for (int i = 1; i <= n; i++) solve(i);} ^ main.cpp: In function 'void setIO(std::__cxx11::string)': main.cpp:14:119: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] void setIO(string filename){if(fopen((filename + ".in").c_str(), "r")){freopen((filename + ".in").c_str(), "r", stdin);freopen((filename + ".out").c_str(), "w", stdout);}} ^ main.cpp:14:169: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] void setIO(string filename){if(fopen((filename + ".in").c_str(), "r")){freopen((filename + ".in").c_str(), "r", stdin);freopen((filename + ".out").c_str(), "w", stdout);}} ^