Compilare: main.cpp: In function 'int main()': main.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < aux.size(); j++){ ~~^~~~~~~~~~~~ main.cpp:62:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::vector<int> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", ans.size()); ^ main.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); i++){ ~~^~~~~~~~~~~~ main.cpp:64:35: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d", ans[i].size()); ^ main.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ans[i].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'bool intro()': main.cpp:18:27: 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:35:41: 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:36:43: 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); ^