Compilare: user.cpp: In function ‘int main()’: user.cpp:80:9: warning: unused variable ‘Q’ [-Wunused-variable] int Q, i, x, y; ^ user.cpp:80:15: warning: unused variable ‘x’ [-Wunused-variable] int Q, i, x, y; ^ user.cpp:80:18: warning: unused variable ‘y’ [-Wunused-variable] int Q, i, x, y; ^ user.cpp:83:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inputFile.c_str(), "r", stdin); ^ user.cpp:84:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outputFile.c_str(), "w", stdout); ^ user.cpp:87:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &K); ^ user.cpp:88:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S + 1); ^