Compilare: main.cpp: In function 'int nr(char*)': main.cpp:8:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 8 | for(int i=0; i<strlen(p); i++) | ~^~~~~~~~~~ main.cpp: In function 'int f2(char*)': main.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i=0; i<strlen(a); i++) | ~^~~~~~~~~~ main.cpp:21:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i=0; i<strlen(a); i++) | ~^~~~~~~~~~ main.cpp:25:34: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 25 | while(a[i]!=')' and i<strlen(a)) | ~^~~~~~~~~~ main.cpp:27:34: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 27 | while(a[i]==')' and i<strlen(a)) | ~^~~~~~~~~~ main.cpp:31:34: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 31 | while(isdigit(a[i]) and i<strlen(a)) | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:24: warning: unused variable 't' [-Wunused-variable] 43 | int j=0,c[101]= {},t; | ^