Compilare: main.cpp: In function 'int calc()': main.cpp:151:57: warning: no return statement in function returning non-void [-Wreturn-type] sola[j][k][i]=' ',solb[j][k][i]=' ',solc[j][k][i]=' ';}}} ^ main.cpp: In function 'int main()': main.cpp:153:32: 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:154:34: 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:156:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&t); ^ main.cpp:158:24: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(a+1,100003,stdin); ^ main.cpp:159:24: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(b+1,100003,stdin); ^ main.cpp:160:24: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(c+1,100003,stdin); ^