Compilare: main.cpp: In function 'int main()': main.cpp:22:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(c);i++) ~^~~~~~~~~~ main.cpp:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<strlen(c);j++) ~^~~~~~~~~~ main.cpp:46:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==strlen(c)-1) ~^~~~~~~~~~~~~ main.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=i+1;k<=strlen(c);k++) ~^~~~~~~~~~~