Compilare: main.cpp: In function 'bool isNr(char)': main.cpp:19:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(c>='0' && c<='9' || c == '\0') ~~~~~~~^~~~~~~~~ main.cpp: In function 'void rez()': main.cpp:30:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s1, 100005, stdin); ^ main.cpp:31:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s2, 100005, stdin); ^ main.cpp:32:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s3, 100005, stdin); ^ main.cpp: In function 'int main()': main.cpp:239:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("puzzle3.in", "r", stdin); ^ main.cpp:240:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("puzzle3.out", "w", stdout); ^ main.cpp:241:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &t); ^