Compilare: main.cpp: In function 'int main()': main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i=i_s+1;i<strlen(s);i++){ | ~^~~~~~~~~~ main.cpp:31:24: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int j=i+1;j<strlen(s);j++){ | ~^~~~~~~~~~ main.cpp:61:26: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 61 | for(int i=i_s+1;i<strlen(s);i++){ | ~^~~~~~~~~~ main.cpp:62:24: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 62 | for(int j=i+1;j<strlen(s);j++){ | ~^~~~~~~~~~ main.cpp:10:9: warning: unused variable 'i' [-Wunused-variable] 10 | int i=0,k,i_s=-1; | ^