Compilare: main.cpp: In function 'void solve()': main.cpp:81:20: warning: unused variable 'cnt' [-Wunused-variable] int N, i, c1, c2, cnt = 16, j; ^~~ main.cpp: In function 'int main()': main.cpp:116:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ main.cpp:117:52: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^