Compilare: main.cpp: In function 'int has(char*)': main.cpp:13:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int i=0;i<strlen(s);i++) | ~^~~~~~~~~~ main.cpp: In function 'int has2(char*)': main.cpp:23:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int i=0;i<strlen(s);i++) | ~^~~~~~~~~~