Compilare: main.cpp: In function 'int main()': main.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i=1;i<=strlen(a)+1;i++) | ~^~~~~~~~~~~~~ main.cpp:15:18: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i=1;i<=strlen(a)+1;i++) | ~^~~~~~~~~~~~~ main.cpp:18:41: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 18 | while(a[st-1]==a[dr-1]&&st>0&&dr<=strlen(a)+1) | ~~^~~~~~~~~~~~~ main.cpp:25:41: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 25 | while(a[st-1]==a[dr-1]&&st>0&&dr<=strlen(a)+1) | ~~^~~~~~~~~~~~~