Eroare de compilare: main.cpp: In function 'int main()': main.cpp:82:30: warning: right operand of comma operator has no effect [-Wunused-value] r = (buck + 1) * rad, lim; ^ main.cpp:105:3: error: 'string' was not declared in this scope string ans; ^~~~~~ main.cpp:107:5: error: 'ans' was not declared in this scope ans += sol[i] + '0'; ^~~ main.cpp:108:16: error: 'ans' was not declared in this scope printf("%s", ans.c_str()); ^~~ main.cpp: In function 'char next_ch()': main.cpp:30:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIM, stdin); ^ main.cpp: In function 'int main()': main.cpp:53:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("deletegcd.in", "r", stdin); ^ main.cpp:54:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("deletegcd.out", "w", stdout); ^ Non zero exit status: 1