Compilare: user.cpp: In function ‘void readInput()’: user.cpp:38:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &N, &M); ^ user.cpp:39:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S + 1); ^ user.cpp: In function ‘int main()’: user.cpp:210:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(scanf("%d", &T); T > 0; T--) { ^ /tmp/ccMrW2SA.o: In function `readInput()': user.cpp:(.text+0x2f): warning: the `gets' function is dangerous and should not be used.