Compilare: main.cpp: In function 'long long int revs(long long int, int)': main.cpp:80:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | for(int i = 0;i < c.size();i++) nrr = nrr * 10 + c[i]; | ~~^~~~~~~~~~ main.cpp: In function 'long long int STOI(std::string)': main.cpp:89:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | for(int i = 0;i < s.size();i++) ans = ans * 10 + (s[i] - '0'); | ~~^~~~~~~~~~ main.cpp: In function 'long long int eval(std::string)': main.cpp:167:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 167 | for(int i = 0;i < ops.size();i++) | ~~^~~~~~~~~~~~ main.cpp:177:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 177 | while(it < ops[i].size()) | ~~~^~~~~~~~~~~~~~~ main.cpp:187:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 187 | for(int i = 0;i < ops.size();i++) | ~~^~~~~~~~~~~~ main.cpp:193:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 193 | for(int j = 0;j < ops[i].size();j++) | ~~^~~~~~~~~~~~~~~ main.cpp:218:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 218 | for(int i = 0;i < res.size() - 1;i++) | ~~^~~~~~~~~~~~~~~~ main.cpp:229:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 229 | for(int i = 0;i < res.size();i++) | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:264:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 264 | while (i < s.size()) | ~~^~~~~~~~~~ main.cpp:279:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 279 | if(l == 0 and r == s.size() - 1) s.clear(); | ~~^~~~~~~~~~~~~~~