Compilare: main.cpp: In function 'int index_str(char*, char, char, char)': main.cpp:6:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 6 | for(int i=0; i<strlen(s)-1; i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int i=0; i<strlen(s2)-2; i++) | ~^~~~~~~~~~~~~