Compilare: main.cpp: In function 'int main()': main.cpp:12:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("text3.in", "r", stdin); ^ main.cpp:13:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("text3.out", "w", stdout); ^ main.cpp:38:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ main.cpp:48:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ main.cpp:40:22: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] char c = first[start]; ~~~~~~~~~~~^