Compilare: main.cpp: In function 'void buildgraph()': main.cpp:18:18: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=0;i<strlen(c)-1;i++) | ~^~~~~~~~~~~~ main.cpp:24:20: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(int i=0;i<strlen(c);i++) | ~^~~~~~~~~~ main.cpp:25:24: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int j=i+1;j<strlen(c);j++) | ~^~~~~~~~~~ main.cpp: In function 'int sol(int)': main.cpp:51:24: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int j=1;j<=strlen(c);j++) | ~^~~~~~~~~~~