Compilare: main.cpp: In function 'int main()': main.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(int j=0;j<strlen(s);j++) | ~^~~~~~~~~~ main.cpp:35:34: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int k=0;k<strlen(s)-1;k++) | ~^~~~~~~~~~~~ main.cpp:39:30: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 39 | for(int k=0;k<strlen(s)-1;k++) | ~^~~~~~~~~~~~ main.cpp:13:13: warning: unused variable 'pres' [-Wunused-variable] 13 | int pres=1; | ^~~~