Compilare: main.cpp: In function 'int main()': main.cpp:71:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < ans[K].size() - 1; j++){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ans[i].size() - 1; j++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool intro()': main.cpp:15:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s", s1, s2); ^ main.cpp: In function 'int main()': main.cpp:47:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("shiftright.in", "r", stdin); ^ main.cpp:48:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("shiftright.out", "w", stdout); ^