Compilare: user.cpp: In function ‘char* solve(int, int, char*)’: user.cpp:34:13: warning: variable ‘found’ set but not used [-Wunused-but-set-variable] bool found; ^ user.cpp: In function ‘void read()’: user.cpp:100:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:102:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &K); ^ user.cpp:104:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S + 1); //to start indexing from 1 ^ user.cpp: In function ‘int main()’: user.cpp:111:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(INI, "r", stdin); ^ user.cpp:112:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUTI, "w", stdout); ^