Compilare: main.cpp: In function 'int index_str(char*, char, char)': main.cpp:6:18: 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 is_next_char(char*, char, int)': main.cpp:14:14: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 14 | if(index ==strlen(s)-1) | ~~~~~~^~~~~~~~~~~~~ main.cpp:16:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=index;i<strlen(s);i++) | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:22: 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++) | ~^~~~~~~~~~~~~